diff --git a/docs/Architecture.md b/docs/Architecture.md
index 845bf0ed..707e1efc 100644
--- a/docs/Architecture.md
+++ b/docs/Architecture.md
@@ -926,7 +926,9 @@ main
 ### HTTP Frontend Auth
 
 - Optional Argon2id-backed managed accounts with HttpOnly session cookies
-- Composable Read, Control, Write, and Administrator roles, with policy shared by middleware and handlers
+- An exclusive Guest role plus composable Read, Control, Transmit, Write, and Administrator roles, with policy shared by middleware and handlers
+- Guest sessions receive read-only station access but no account-control endpoints or panels
+- Transmit separately gates PTT, TX audio frames, and TX power-limit changes
 - Atomic JSON persistence with migration from the legacy single-role schema
 - Account enable/disable, administrator CRUD, self-service password changes, and session revocation on security changes
 - A database invariant always preserves at least one enabled administrator
diff --git a/docs/Planned-Features.md b/docs/Planned-Features.md
index a6fc3e6f..30d9bf08 100644
--- a/docs/Planned-Features.md
+++ b/docs/Planned-Features.md
@@ -541,8 +541,8 @@ setting, which is also what LoTW's station locations expect.
 rotate operators through one station callsign, which is why contest loggers record it per QSO.
 It is stored per QSO, defaulted from the configured callsign so a single operator never touches
 it, and changed on the station line at the top of the panel where it sticks for the session.
-It cannot be taken from the session's identity: the auth roles are `admin` and `user`, with no
-notion of who is logged in.
+It cannot be inferred from the session's identity: an account username need not be an operator
+callsign, and operational accounts may be shared.
 
 **Server clock, and the log says so.** The server is the machine at the radio; the browser may
 be on a phone in another timezone with a clock nobody has checked. QSO times are UTC from the
diff --git a/docs/UX_Guidelines.md b/docs/UX_Guidelines.md
index a4f0f966..7f5eed35 100644
--- a/docs/UX_Guidelines.md
+++ b/docs/UX_Guidelines.md
@@ -126,7 +126,8 @@ When auth is enabled, an **auth gate** blocks the UI with:
 - Error message area (red `#ff6b6b`)
 - Role badge display
 
-Accounts may combine **Read**, **Control**, **Write**, and **Administrator** roles.
+**Guest** provides read-only station access and is exclusive. Non-Guest accounts
+may combine **Read**, **Control**, **Transmit**, **Write**, and **Administrator** roles.
 Administrator implies all permissions.
 
 Session cookie: `trx_http_sid`, HttpOnly, configurable Secure and SameSite attributes.
@@ -336,13 +337,14 @@ Logo and favicon are embedded at compile time via `include_bytes!`. The logo ima
 
 ### 7.1 Route Access Classification
 
-Routes are classified into three tiers:
+Routes are classified into access tiers:
 
 | Tier | Examples | Requirement |
 |---|---|---|
 | **Public** | `/`, `/index.html`, `/map`, login/session endpoints, static assets | None |
-| **Read** | `/status`, `/events`, `/audio`, `/decode`, `/spectrum`, `/bookmarks` | Read, Control, or Administrator role |
-| **Control** | `/set_freq`, `/set_mode`, `/set_ptt`, `/toggle_power`, radio-control POST routes | Control or Administrator role |
+| **Read** | `/status`, `/events`, `/audio`, `/decode`, `/spectrum`, `/bookmarks` | Guest, Read, Control, Transmit, or Administrator role |
+| **Control** | `/set_freq`, `/set_mode`, `/toggle_power`, receive-side radio-control POST routes | Control or Administrator role |
+| **Transmit** | `/set_ptt`, `/set_tx_limit`, outbound `/audio` frames | Transmit or Administrator role |
 | **Write** | Logbook access and bookmark mutations | Write or Administrator role |
 
 ### 7.2 Session Management
@@ -354,8 +356,9 @@ Routes are classified into three tiers:
 
 ### 7.3 User Management
 
-Every authenticated account gets a Settings > Account tab for changing its own
-password. Only administrators get Settings > Users, where accounts can be
+Every authenticated non-Guest account gets a Settings > Account tab for changing
+its own password. Guest sees neither Account nor Users and both account-control
+APIs deny Guest sessions. Only administrators get Settings > Users, where accounts can be
 created, enabled/disabled, assigned multiple roles, given a new password, or
 removed. The final enabled administrator cannot be disabled, removed, or
 demoted. Account security changes revoke every active session for that account.
diff --git a/docs/User-Manual.md b/docs/User-Manual.md
index b4c65650..3350bbc2 100644
--- a/docs/User-Manual.md
+++ b/docs/User-Manual.md
@@ -354,9 +354,9 @@ A name in any of those maps that no remote answers to is a config error.
 | `bootstrap_admin_username` | string | — | First administrator, used only if the database is absent |
 | `bootstrap_admin_password` | string | — | First administrator password |
 | `bootstrap_admin_password_file` | string | — | Read the bootstrap password from this file instead |
-| `bootstrap_read_enabled` | bool | `true` | Create the default read-only account when the database is absent |
-| `bootstrap_read_username` | string | `"guest"` | Initial read-only username |
-| `bootstrap_read_password` | string | `"guest"` | Initial read-only password |
+| `bootstrap_read_enabled` | bool | `true` | Create the default Guest account when the database is absent |
+| `bootstrap_read_username` | string | `"guest"` | Initial Guest username |
+| `bootstrap_read_password` | string | `"guest"` | Initial Guest password |
 | `session_ttl_min` | u64 | `480` | Session lifetime |
 | `cookie_secure` | bool | `false` | Set Secure on the session cookie (needs HTTPS) |
 | `cookie_same_site` | string | `"Lax"` | `Strict`, `Lax`, or `None` |
@@ -589,11 +589,12 @@ left as it was, rather than publishing a frequency the rig is not on.
 
 ## Authentication
 
-The HTTP frontend supports an optional user/password ACL with multiple independent
-roles. One account may have any combination:
+The HTTP frontend supports an optional user/password ACL:
 
+- **Guest** — read-only station access with no Account or Users controls; Guest cannot be combined with another role
 - **Read** — monitoring, audio, decode streams, and bookmark reads
-- **Control** — full radio receive/transmit controls
+- **Control** — tuning, mode, power, and receive-side radio controls
+- **Transmit** — PTT, transmitted audio, and TX power-limit controls
 - **Write** — logbook access and bookmark changes
 - **Administrator** — user management and all other permissions
 
@@ -615,7 +616,7 @@ cookie_same_site = "Lax"   # Strict|Lax|None
 
 When `enabled = false` (the default), all auth is bypassed and the UI behaves
 as before. When enabling it for the first time, bootstrap credentials create
-the initial administrator (with every role), the default `guest`/`guest` Read
+the initial administrator (with every non-Guest role), the default `guest`/`guest` Guest
 account, and the Argon2id-hashed user database. Change or disable the guest
 credentials in configuration before first startup on an exposed deployment.
 
@@ -625,8 +626,9 @@ credentials in configuration before first startup on an exposed deployment.
 - Sessions are in-memory; a server restart invalidates all sessions.
 - Rate limiting is applied per IP to mitigate brute-force attempts.
 - User records persist in `users_file`; passwords are stored as salted Argon2id hashes.
-- Roles are independent; for example, an account may have Read and Write without Control.
-- Every signed-in user can change their own password in Settings > Account. This signs out all of their sessions.
+- Non-Guest roles are independent; for example, an account may have Read and Write without Control.
+- Guest accounts have no account-control panels and cannot call account-control endpoints.
+- Every non-Guest signed-in user can change their own password in Settings > Account. This signs out all of their sessions.
 - Administrators can add, enable/disable, or remove users and change roles/passwords in Settings > Users.
 - At least one enabled administrator must always remain and cannot be disabled, removed, or demoted.
 - Disabling/removing an account or changing its password/roles revokes all of its sessions.
@@ -639,12 +641,13 @@ credentials in configuration before first startup on an exposed deployment.
 | `/auth/login` | POST | Submit `{ "username": "...", "password": "..." }` |
 | `/auth/logout` | POST | Clear session |
 | `/auth/session` | GET | Check current session/roles |
-| `/auth/account/password` | PATCH | Change the signed-in user's password after verifying the current password |
+| `/auth/account/password` | PATCH | Change a non-Guest user's password after verifying the current password |
 | `/auth/users` | GET/POST | List or add users (admin only) |
 | `/auth/users/{username}` | PATCH/DELETE | Change enabled state/password/roles or remove user (administrator only) |
 
-Read routes require Read. Radio mutations require Control. Logbook access and
-bookmark mutations require Write. Administrator grants every permission.
+Read routes accept Guest or require Read. Tuning and receive-side radio mutations
+require Control. PTT, transmitted audio, and TX limit changes require Transmit.
+Logbook access and bookmark mutations require Write. Administrator grants every permission.
 
 ### Frontend Flow
 
diff --git a/src/trx-client/trx-frontend/trx-frontend-http/assets/web/generated/app.js b/src/trx-client/trx-frontend/trx-frontend-http/assets/web/generated/app.js
index 46e71af0..351d3412 100644
--- a/src/trx-client/trx-frontend/trx-frontend-http/assets/web/generated/app.js
+++ b/src/trx-client/trx-frontend/trx-frontend-http/assets/web/generated/app.js
@@ -1,17 +1,19 @@
 import {
+  AUTH_ADMIN_ROLES,
   AUTH_ROLES,
   AUTH_ROLE_LABELS,
   changeOwnPassword,
   createUser,
   deleteUser,
   fetchAuthSession,
+  hasAccountControls,
   hasAuthRole,
   listUsers,
   login,
   logout,
   normalizeAuthRoles,
   updateUser
-} from "./chunk-BB2X7SND.js";
+} from "./chunk-PISLBJGN.js";
 
 // src/webgl-renderer.ts
 (function initTrxWebGl(global) {
@@ -1846,6 +1848,19 @@ function buildRoleChoices(selected) {
     element.append(label);
     return { input, value };
   });
+  inputs.forEach(({ input, value }) => {
+    input.addEventListener("change", () => {
+      if (!input.checked) return;
+      if (value === "guest") {
+        inputs.forEach((choice) => {
+          if (choice.value !== "guest") choice.input.checked = false;
+        });
+      } else {
+        const guest = inputs.find((choice) => choice.value === "guest");
+        if (guest) guest.input.checked = false;
+      }
+    });
+  });
   return { element, inputs };
 }
 async function checkAuthStatus() {
@@ -1932,7 +1947,13 @@ function updateAuthUI() {
     return;
   }
   if (authRoles.length > 0) {
-    if (accountTab) accountTab.style.display = "";
+    const canManageAccount = hasAccountControls(authRoles);
+    if (accountTab) accountTab.style.display = canManageAccount ? "" : "none";
+    if (!canManageAccount && accountTab?.classList.contains("active")) {
+      const panel = document.getElementById("subtab-settings-account");
+      if (panel) panel.style.display = "none";
+      document.querySelector('[data-subtab="settings-scheduler"]')?.click();
+    }
     if (badge) badge.style.display = "block";
     if (badgeRole) badgeRole.textContent = `${authUsername || "local"} — ${authRoles.map((role) => AUTH_ROLE_LABELS[role]).join(", ")}`;
     if (headerAuthBtn2) {
@@ -1951,30 +1972,33 @@ function updateAuthUI() {
 }
 function applyAuthRestrictions() {
   if (authRoles.length === 0) return;
-  if (!hasAuthRole2("control")) {
+  if (!hasAuthRole2("transmit")) {
     const pttBtn2 = document.getElementById("ptt-btn");
+    const txLimitInput2 = document.getElementById("tx-limit");
+    const txLimitBtn2 = document.getElementById("tx-limit-btn");
+    const txAudioBtn2 = document.getElementById("tx-audio-btn");
+    const txLimitRow2 = document.getElementById("tx-limit-row");
+    if (pttBtn2) pttBtn2.disabled = true;
+    if (txAudioBtn2) txAudioBtn2.disabled = true;
+    if (txLimitBtn2) txLimitBtn2.disabled = true;
+    if (txLimitInput2) txLimitInput2.disabled = true;
+    if (txLimitRow2) txLimitRow2.style.opacity = "0.5";
+  }
+  if (!hasAuthRole2("control")) {
     const powerBtn2 = document.getElementById("power-btn");
     const lockBtn2 = document.getElementById("lock-btn");
     const freqInput = document.getElementById("freq");
     const centerFreqInput = document.getElementById("center-freq");
     const modeSelect = document.getElementById("mode");
-    const txLimitInput2 = document.getElementById("tx-limit");
-    const txLimitBtn2 = document.getElementById("tx-limit-btn");
-    const txAudioBtn2 = document.getElementById("tx-audio-btn");
-    const txLimitRow2 = document.getElementById("tx-limit-row");
     const jogUp = document.getElementById("jog-up");
     const jogDown = document.getElementById("jog-down");
     const jogButtons = document.querySelectorAll(".jog-step button");
     const vfoButtons = document.querySelectorAll("#vfo-picker button");
-    if (pttBtn2) pttBtn2.disabled = true;
     if (powerBtn2) powerBtn2.disabled = true;
     if (lockBtn2) lockBtn2.disabled = true;
-    if (txAudioBtn2) txAudioBtn2.disabled = true;
-    if (txLimitBtn2) txLimitBtn2.disabled = true;
     if (freqInput) freqInput.disabled = true;
     if (centerFreqInput) centerFreqInput.disabled = true;
     if (modeSelect) modeSelect.disabled = true;
-    if (txLimitInput2) txLimitInput2.disabled = true;
     vfoButtons.forEach((btn) => btn.disabled = true);
     const jogWheel2 = document.getElementById("jog-wheel");
     if (jogUp) jogUp.disabled = true;
@@ -2011,7 +2035,6 @@ function applyAuthRestrictions() {
         btn.disabled = true;
       }
     });
-    if (txLimitRow2) txLimitRow2.style.opacity = "0.5";
   }
 }
 function applyCapabilities(caps) {
@@ -4229,9 +4252,16 @@ function formatSignal(sUnits) {
   return overDb === 0 ? `${sigUnit("S")}9` : `${sigUnit("S")}9+${overDb}${sigUnit("dB")}`;
 }
 function setDisabled(disabled) {
-  [freqEl, centerFreqEl, modeEl, pttBtn, powerBtn, txLimitInput, txLimitBtn, lockBtn].forEach((el) => {
-    if (el) el.disabled = disabled;
+  const controlDisabled = disabled || authEnabled && !hasAuthRole2("control");
+  const transmitDisabled = disabled || authEnabled && !hasAuthRole2("transmit");
+  [freqEl, centerFreqEl, modeEl, powerBtn, lockBtn].forEach((el) => {
+    if (el) el.disabled = controlDisabled;
   });
+  [pttBtn, txLimitInput, txLimitBtn].forEach((el) => {
+    if (el) el.disabled = transmitDisabled;
+  });
+  const transmitAudio = document.getElementById("tx-audio-btn");
+  if (transmitAudio) transmitAudio.disabled = transmitDisabled || !hasWebCodecs;
   syncModePicker();
 }
 var serverVersion = null;
@@ -5974,7 +6004,7 @@ async function initializeApp() {
   const authStatus = await checkAuthStatus();
   authEnabled = !authStatus.auth_disabled;
   if (!authEnabled) {
-    setAuthRoles(AUTH_ROLES);
+    setAuthRoles(AUTH_ADMIN_ROLES);
     hideAuthGate();
     updateAuthUI();
     connect();
@@ -6047,10 +6077,15 @@ async function refreshUserManagement() {
       enabledLabel.append(enabled, " Enabled");
       const isOnlyAdmin = user.enabled && hasAuthRole(user.roles, "administrator") && enabledAdminCount === 1;
       const administratorInput = roleInputs.find((item) => item.value === "administrator")?.input;
+      const guestInput = roleInputs.find((item) => item.value === "guest")?.input;
       if (isOnlyAdmin && administratorInput) {
         administratorInput.disabled = true;
         administratorInput.title = "The final administrator cannot be demoted";
       }
+      if (isOnlyAdmin && guestInput) {
+        guestInput.disabled = true;
+        guestInput.title = "The final administrator cannot become a Guest";
+      }
       if (isOnlyAdmin) {
         enabled.disabled = true;
         enabled.title = "The final enabled administrator cannot be disabled";
@@ -7303,6 +7338,10 @@ function startTxAudio() {
     void stopTxAudio();
     return;
   }
+  if (authEnabled && !hasAuthRole2("transmit")) {
+    audioStatus.textContent = "Transmit role required";
+    return;
+  }
   if (!hasWebCodecs) {
     audioStatus.textContent = "Audio requires Chrome/Edge";
     return;
diff --git a/src/trx-client/trx-frontend/trx-frontend-http/assets/web/generated/background-decode.js b/src/trx-client/trx-frontend/trx-frontend-http/assets/web/generated/background-decode.js
index c30098cf..1c7d77c4 100644
--- a/src/trx-client/trx-frontend/trx-frontend-http/assets/web/generated/background-decode.js
+++ b/src/trx-client/trx-frontend/trx-frontend-http/assets/web/generated/background-decode.js
@@ -1,6 +1,6 @@
 import {
   hasAuthRole
-} from "./chunk-BB2X7SND.js";
+} from "./chunk-PISLBJGN.js";
 import {
   hostState
 } from "./chunk-KL66PICH.js";
diff --git a/src/trx-client/trx-frontend/trx-frontend-http/assets/web/generated/bookmarks.js b/src/trx-client/trx-frontend/trx-frontend-http/assets/web/generated/bookmarks.js
index 173a4eaa..c18690db 100644
--- a/src/trx-client/trx-frontend/trx-frontend-http/assets/web/generated/bookmarks.js
+++ b/src/trx-client/trx-frontend/trx-frontend-http/assets/web/generated/bookmarks.js
@@ -1,6 +1,6 @@
 import {
   hasAuthRole
-} from "./chunk-BB2X7SND.js";
+} from "./chunk-PISLBJGN.js";
 import {
   hostCore,
   hostState
diff --git a/src/trx-client/trx-frontend/trx-frontend-http/assets/web/generated/chunk-BB2X7SND.js b/src/trx-client/trx-frontend/trx-frontend-http/assets/web/generated/chunk-PISLBJGN.js
similarity index 90%
rename from src/trx-client/trx-frontend/trx-frontend-http/assets/web/generated/chunk-BB2X7SND.js
rename to src/trx-client/trx-frontend/trx-frontend-http/assets/web/generated/chunk-PISLBJGN.js
index 4de8b509..005ee4c1 100644
--- a/src/trx-client/trx-frontend/trx-frontend-http/assets/web/generated/chunk-BB2X7SND.js
+++ b/src/trx-client/trx-frontend/trx-frontend-http/assets/web/generated/chunk-PISLBJGN.js
@@ -1,8 +1,11 @@
 // src/api/auth.ts
-var AUTH_ROLES = ["read", "control", "write", "administrator"];
+var AUTH_ROLES = ["guest", "read", "control", "transmit", "write", "administrator"];
+var AUTH_ADMIN_ROLES = AUTH_ROLES.filter((role) => role !== "guest");
 var AUTH_ROLE_LABELS = {
+  guest: "Guest",
   read: "Read",
   control: "Control",
+  transmit: "Transmit",
   write: "Write",
   administrator: "Administrator"
 };
@@ -13,7 +16,10 @@ function normalizeAuthRoles(roles) {
   return AUTH_ROLES.filter((role) => roles.includes(role));
 }
 function hasAuthRole(roles, required) {
-  return roles.includes("administrator") || roles.includes(required) || required === "read" && roles.includes("control");
+  return roles.includes("administrator") || roles.includes(required) || required === "read" && roles.includes("guest") || required === "read" && (roles.includes("control") || roles.includes("transmit"));
+}
+function hasAccountControls(roles) {
+  return roles.length > 0 && !roles.includes("guest");
 }
 function decodeRoles(value, context) {
   if (!Array.isArray(value) || !value.every(isAuthRole)) {
@@ -45,7 +51,7 @@ function decodeAuthSession(value) {
 }
 var authDisabledSession = {
   authenticated: true,
-  roles: ["read", "control", "write", "administrator"],
+  roles: [...AUTH_ADMIN_ROLES],
   auth_disabled: true
 };
 async function fetchAuthSession() {
@@ -114,9 +120,11 @@ async function logout() {
 
 export {
   AUTH_ROLES,
+  AUTH_ADMIN_ROLES,
   AUTH_ROLE_LABELS,
   normalizeAuthRoles,
   hasAuthRole,
+  hasAccountControls,
   fetchAuthSession,
   login,
   listUsers,
diff --git a/src/trx-client/trx-frontend/trx-frontend-http/assets/web/generated/logbook.js b/src/trx-client/trx-frontend/trx-frontend-http/assets/web/generated/logbook.js
index 89a1b8f8..348f836e 100644
--- a/src/trx-client/trx-frontend/trx-frontend-http/assets/web/generated/logbook.js
+++ b/src/trx-client/trx-frontend/trx-frontend-http/assets/web/generated/logbook.js
@@ -1,6 +1,6 @@
 import {
   hasAuthRole
-} from "./chunk-BB2X7SND.js";
+} from "./chunk-PISLBJGN.js";
 import {
   hostCore,
   hostState
diff --git a/src/trx-client/trx-frontend/trx-frontend-http/assets/web/generated/scheduler.js b/src/trx-client/trx-frontend/trx-frontend-http/assets/web/generated/scheduler.js
index 255e46b0..2131772e 100644
--- a/src/trx-client/trx-frontend/trx-frontend-http/assets/web/generated/scheduler.js
+++ b/src/trx-client/trx-frontend/trx-frontend-http/assets/web/generated/scheduler.js
@@ -1,6 +1,6 @@
 import {
   hasAuthRole
-} from "./chunk-BB2X7SND.js";
+} from "./chunk-PISLBJGN.js";
 import {
   hostState
 } from "./chunk-KL66PICH.js";
diff --git a/src/trx-client/trx-frontend/trx-frontend-http/frontend/package.json b/src/trx-client/trx-frontend/trx-frontend-http/frontend/package.json
index b008f062..b7fbc068 100644
--- a/src/trx-client/trx-frontend/trx-frontend-http/frontend/package.json
+++ b/src/trx-client/trx-frontend/trx-frontend-http/frontend/package.json
@@ -12,7 +12,7 @@
     "typecheck": "tsc --project tsconfig.json && tsc --project tsconfig.worker.json",
     "lint": "eslint \"src/**/*.ts\" \"tests/**/*.mjs\" build.mjs --no-error-on-unmatched-pattern",
     "test": "node --test tests/*.test.mjs",
-    "test:browser": "node tests/browser-smoke.mjs && node tests/spectrum-layout.mjs && node tests/decode-flow.mjs && node tests/tune-links.mjs && node tests/mobile-layout.mjs && node tests/satellite-predictions.mjs && node tests/background-decode.mjs && node tests/logbook.mjs && node tests/account-management.mjs",
+    "test:browser": "node tests/browser-smoke.mjs && node tests/spectrum-layout.mjs && node tests/decode-flow.mjs && node tests/tune-links.mjs && node tests/mobile-layout.mjs && node tests/satellite-predictions.mjs && node tests/background-decode.mjs && node tests/logbook.mjs && node tests/account-management.mjs && node tests/transmit-role.mjs",
     "verify-generated": "npm run generate-types && npm run build && git diff --exit-code -- ../assets/web/generated src/api/generated.ts"
   },
   "devDependencies": {
diff --git a/src/trx-client/trx-frontend/trx-frontend-http/frontend/src/api/auth.ts b/src/trx-client/trx-frontend/trx-frontend-http/frontend/src/api/auth.ts
index 8534f8f4..bc682318 100644
--- a/src/trx-client/trx-frontend/trx-frontend-http/frontend/src/api/auth.ts
+++ b/src/trx-client/trx-frontend/trx-frontend-http/frontend/src/api/auth.ts
@@ -6,10 +6,13 @@ import type { AuthRole } from "./generated.js";
 
 export type { AuthRole };
 
-export const AUTH_ROLES: readonly AuthRole[] = ["read", "control", "write", "administrator"];
+export const AUTH_ROLES: readonly AuthRole[] = ["guest", "read", "control", "transmit", "write", "administrator"];
+export const AUTH_ADMIN_ROLES: readonly AuthRole[] = AUTH_ROLES.filter(role => role !== "guest");
 export const AUTH_ROLE_LABELS: Readonly<Record<AuthRole, string>> = {
+  guest: "Guest",
   read: "Read",
   control: "Control",
+  transmit: "Transmit",
   write: "Write",
   administrator: "Administrator",
 };
@@ -25,7 +28,12 @@ export function normalizeAuthRoles(roles: readonly AuthRole[]): AuthRole[] {
 export function hasAuthRole(roles: readonly AuthRole[], required: AuthRole): boolean {
   return roles.includes("administrator")
     || roles.includes(required)
-    || required === "read" && roles.includes("control");
+    || required === "read" && roles.includes("guest")
+    || required === "read" && (roles.includes("control") || roles.includes("transmit"));
+}
+
+export function hasAccountControls(roles: readonly AuthRole[]): boolean {
+  return roles.length > 0 && !roles.includes("guest");
 }
 
 function decodeRoles(value: unknown, context: string): AuthRole[] {
@@ -67,7 +75,7 @@ function decodeAuthSession(value: unknown): AuthSession {
 
 const authDisabledSession: AuthSession = {
   authenticated: true,
-  roles: ["read", "control", "write", "administrator"],
+  roles: [...AUTH_ADMIN_ROLES],
   auth_disabled: true,
 };
 
diff --git a/src/trx-client/trx-frontend/trx-frontend-http/frontend/src/api/generated.ts b/src/trx-client/trx-frontend/trx-frontend-http/frontend/src/api/generated.ts
index 31191c98..13a84a2c 100644
--- a/src/trx-client/trx-frontend/trx-frontend-http/frontend/src/api/generated.ts
+++ b/src/trx-client/trx-frontend/trx-frontend-http/frontend/src/api/generated.ts
@@ -123,7 +123,7 @@ export type RigListResponse = { active_remote: string | null, rigs: Array<RigLis
 
 export type FrontendMeta = { clients: number, rigctl_clients: number, audio_clients: number, rigctl_addr: string | null, active_remote: string | null, remotes: Array<string>, owner_callsign: string | null, owner_website_url: string | null, owner_website_name: string | null, ais_vessel_url_base: string | null, show_sdr_gain_control: boolean, initial_map_zoom: number, spectrum_coverage_margin_hz: number, spectrum_usable_span_ratio: number, bandplan_enabled: boolean, bandplan_region: string, decode_history_retention_min: bigint, server_connected: boolean, };
 
-export type AuthRole = "read" | "control" | "write" | "administrator";
+export type AuthRole = "guest" | "read" | "control" | "transmit" | "write" | "administrator";
 
 export type DecoderActivation = "mode_bound" | "toggle";
 
diff --git a/src/trx-client/trx-frontend/trx-frontend-http/frontend/src/app.ts b/src/trx-client/trx-frontend/trx-frontend-http/frontend/src/app.ts
index 0a0d4b53..830be597 100644
--- a/src/trx-client/trx-frontend/trx-frontend-http/frontend/src/app.ts
+++ b/src/trx-client/trx-frontend/trx-frontend-http/frontend/src/app.ts
@@ -26,8 +26,10 @@ import {
   updateUser,
   deleteUser,
   changeOwnPassword,
+  AUTH_ADMIN_ROLES,
   AUTH_ROLES,
   AUTH_ROLE_LABELS,
+  hasAccountControls,
   hasAuthRole as rolesInclude,
   normalizeAuthRoles,
 } from "./api/auth.js";
@@ -441,6 +443,17 @@ function buildRoleChoices(selected: readonly AuthRole[]) {
     element.append(label);
     return { input, value };
   });
+  inputs.forEach(({ input, value }) => {
+    input.addEventListener("change", () => {
+      if (!input.checked) return;
+      if (value === "guest") {
+        inputs.forEach(choice => { if (choice.value !== "guest") choice.input.checked = false; });
+      } else {
+        const guest = inputs.find(choice => choice.value === "guest");
+        if (guest) guest.input.checked = false;
+      }
+    });
+  });
   return { element, inputs };
 }
 
@@ -544,7 +557,13 @@ function updateAuthUI() {
   }
 
   if (authRoles.length > 0) {
-    if (accountTab) accountTab.style.display = "";
+    const canManageAccount = hasAccountControls(authRoles);
+    if (accountTab) accountTab.style.display = canManageAccount ? "" : "none";
+    if (!canManageAccount && accountTab?.classList.contains("active")) {
+      const panel = document.getElementById("subtab-settings-account");
+      if (panel) panel.style.display = "none";
+      document.querySelector<HTMLButtonElement>('[data-subtab="settings-scheduler"]')?.click();
+    }
     if (badge) badge.style.display = "block";
     if (badgeRole) badgeRole.textContent = `${authUsername || "local"} — ${authRoles.map(role => AUTH_ROLE_LABELS[role]).join(", ")}`;
     if (headerAuthBtn) {
@@ -565,35 +584,38 @@ function updateAuthUI() {
 function applyAuthRestrictions() {
   if (authRoles.length === 0) return;
 
-  // Disable TX/PTT/frequency/mode/VFO controls for user role
-  if (!hasAuthRole("control")) {
+  if (!hasAuthRole("transmit")) {
     const pttBtn = document.getElementById("ptt-btn") as HTMLButtonElement | null;
+    const txLimitInput = document.getElementById("tx-limit") as HTMLInputElement | null;
+    const txLimitBtn = document.getElementById("tx-limit-btn") as HTMLButtonElement | null;
+    const txAudioBtn = document.getElementById("tx-audio-btn") as HTMLButtonElement | null;
+    const txLimitRow = document.getElementById("tx-limit-row");
+    if (pttBtn) pttBtn.disabled = true;
+    if (txAudioBtn) txAudioBtn.disabled = true;
+    if (txLimitBtn) txLimitBtn.disabled = true;
+    if (txLimitInput) txLimitInput.disabled = true;
+    if (txLimitRow) txLimitRow.style.opacity = "0.5";
+  }
+
+  // General tuning and receive-side controls require Control.
+  if (!hasAuthRole("control")) {
     const powerBtn = document.getElementById("power-btn") as HTMLButtonElement | null;
     const lockBtn = document.getElementById("lock-btn") as HTMLButtonElement | null;
     const freqInput = document.getElementById("freq") as HTMLInputElement | null;
     const centerFreqInput = document.getElementById("center-freq") as HTMLInputElement | null;
     const modeSelect = document.getElementById("mode") as HTMLSelectElement | null;
-    const txLimitInput = document.getElementById("tx-limit") as HTMLInputElement | null;
-    const txLimitBtn = document.getElementById("tx-limit-btn") as HTMLButtonElement | null;
-    const txAudioBtn = document.getElementById("tx-audio-btn") as HTMLButtonElement | null;
-    const txLimitRow = document.getElementById("tx-limit-row");
     const jogUp = document.getElementById("jog-up") as HTMLButtonElement | null;
     const jogDown = document.getElementById("jog-down") as HTMLButtonElement | null;
     const jogButtons = document.querySelectorAll<HTMLButtonElement>(".jog-step button");
     const vfoButtons = document.querySelectorAll<HTMLButtonElement>("#vfo-picker button");
 
-    // Disable TX buttons
-    if (pttBtn) pttBtn.disabled = true;
     if (powerBtn) powerBtn.disabled = true;
     if (lockBtn) lockBtn.disabled = true;
-    if (txAudioBtn) txAudioBtn.disabled = true;
-    if (txLimitBtn) txLimitBtn.disabled = true;
 
     // Disable frequency/mode inputs
     if (freqInput) freqInput.disabled = true;
     if (centerFreqInput) centerFreqInput.disabled = true;
     if (modeSelect) modeSelect.disabled = true;
-    if (txLimitInput) txLimitInput.disabled = true;
 
     // Disable VFO selector
     vfoButtons.forEach(btn => btn.disabled = true);
@@ -637,9 +659,6 @@ function applyAuthRestrictions() {
         btn.disabled = true;
       }
     });
-
-    // Hide TX-specific UI but keep controls visible (disabled)
-    if (txLimitRow) txLimitRow.style.opacity = "0.5";
   }
 }
 
@@ -3061,9 +3080,16 @@ function formatSignal(sUnits: number) {
 }
 
 function setDisabled(disabled: boolean) {
-  [freqEl, centerFreqEl, modeEl, pttBtn, powerBtn, txLimitInput, txLimitBtn, lockBtn].forEach((el) => {
-    if (el) el.disabled = disabled;
+  const controlDisabled = disabled || (authEnabled && !hasAuthRole("control"));
+  const transmitDisabled = disabled || (authEnabled && !hasAuthRole("transmit"));
+  [freqEl, centerFreqEl, modeEl, powerBtn, lockBtn].forEach((el) => {
+    if (el) el.disabled = controlDisabled;
   });
+  [pttBtn, txLimitInput, txLimitBtn].forEach((el) => {
+    if (el) el.disabled = transmitDisabled;
+  });
+  const transmitAudio = document.getElementById("tx-audio-btn") as HTMLButtonElement | null;
+  if (transmitAudio) transmitAudio.disabled = transmitDisabled || !hasWebCodecs;
   syncModePicker();
 }
 
@@ -5050,7 +5076,7 @@ async function initializeApp() {
   authEnabled = !authStatus.auth_disabled;
 
   if (!authEnabled) {
-    setAuthRoles(AUTH_ROLES);
+    setAuthRoles(AUTH_ADMIN_ROLES);
     hideAuthGate();
     updateAuthUI();
     connect();
@@ -5132,10 +5158,15 @@ async function refreshUserManagement() {
         && rolesInclude(user.roles, "administrator")
         && enabledAdminCount === 1;
       const administratorInput = roleInputs.find(item => item.value === "administrator")?.input;
+      const guestInput = roleInputs.find(item => item.value === "guest")?.input;
       if (isOnlyAdmin && administratorInput) {
         administratorInput.disabled = true;
         administratorInput.title = "The final administrator cannot be demoted";
       }
+      if (isOnlyAdmin && guestInput) {
+        guestInput.disabled = true;
+        guestInput.title = "The final administrator cannot become a Guest";
+      }
       if (isOnlyAdmin) {
         enabled.disabled = true;
         enabled.title = "The final enabled administrator cannot be disabled";
@@ -6346,6 +6377,10 @@ function stopRxAudio() {
 
 function startTxAudio() {
   if (txActive) { void stopTxAudio(); return; }
+  if (authEnabled && !hasAuthRole("transmit")) {
+    audioStatus.textContent = "Transmit role required";
+    return;
+  }
   if (!hasWebCodecs) {
     audioStatus.textContent = "Audio requires Chrome/Edge";
     return;
diff --git a/src/trx-client/trx-frontend/trx-frontend-http/frontend/tests/account-management.mjs b/src/trx-client/trx-frontend/trx-frontend-http/frontend/tests/account-management.mjs
index 7bdb8959..bd7b052a 100644
--- a/src/trx-client/trx-frontend/trx-frontend-http/frontend/tests/account-management.mjs
+++ b/src/trx-client/trx-frontend/trx-frontend-http/frontend/tests/account-management.mjs
@@ -8,7 +8,7 @@ import { startBrowser, startWebFixture } from "./web-fixture.mjs";
 
 /* global document */
 
-const ALL_ROLES = ["read", "control", "write", "administrator"];
+const ALL_ROLES = ["read", "control", "transmit", "write", "administrator"];
 const fixture = await startWebFixture({
   authSession: {
     authenticated: true,
@@ -47,14 +47,16 @@ try {
       createRoles: [...document.querySelectorAll("#user-create-roles input")].map((input) => input.value),
       adminEnabledLocked: admin?.querySelector('input[type="checkbox"]')?.disabled,
       adminRoleLocked: role(admin, "administrator")?.disabled,
+      adminGuestLocked: role(admin, "guest")?.disabled,
       adminRemoveLocked: admin?.querySelector("button.danger")?.disabled,
       listenerEnabled: listener?.querySelector('input[type="checkbox"]')?.checked,
       listenerRead: role(listener, "read")?.checked,
     };
   });
-  assert.deepEqual(state.createRoles, ALL_ROLES);
+  assert.deepEqual(state.createRoles, ["guest", ...ALL_ROLES]);
   assert.equal(state.adminEnabledLocked, true);
   assert.equal(state.adminRoleLocked, true);
+  assert.equal(state.adminGuestLocked, true);
   assert.equal(state.adminRemoveLocked, true);
   assert.equal(state.listenerEnabled, false);
   assert.equal(state.listenerRead, true);
@@ -63,3 +65,23 @@ try {
   await browser.close();
   await fixture.close();
 }
+
+const guestFixture = await startWebFixture({
+  authSession: {
+    authenticated: true,
+    username: "guest",
+    roles: ["guest"],
+    auth_disabled: false,
+  },
+});
+const guestBrowser = await startBrowser(chromium);
+try {
+  await guestBrowser.page.goto(`${guestFixture.origin}/settings`, { waitUntil: "domcontentloaded" });
+  await guestBrowser.page.locator("#tab-settings").waitFor({ state: "visible" });
+  assert.equal(await guestBrowser.page.locator("#settings-account-tab").isVisible(), false);
+  assert.equal(await guestBrowser.page.locator("#settings-users-tab").isVisible(), false);
+  assert.deepEqual(guestBrowser.runtimeErrors, []);
+} finally {
+  await guestBrowser.browser.close();
+  await guestFixture.close();
+}
diff --git a/src/trx-client/trx-frontend/trx-frontend-http/frontend/tests/auth.test.mjs b/src/trx-client/trx-frontend/trx-frontend-http/frontend/tests/auth.test.mjs
index f79d36f6..0204bc32 100644
--- a/src/trx-client/trx-frontend/trx-frontend-http/frontend/tests/auth.test.mjs
+++ b/src/trx-client/trx-frontend/trx-frontend-http/frontend/tests/auth.test.mjs
@@ -15,10 +15,15 @@ function loadAuth(fetch) {
   return context.AuthApi;
 }
 
-test("role policy is centralized and preserves the Control-to-Read implication", () => {
+test("role policy centralizes Guest and separates Control from Transmit", () => {
   const auth = loadAuth(async () => { throw new Error("unused"); });
-  assert.deepEqual(Array.from(auth.AUTH_ROLES), ["read", "control", "write", "administrator"]);
+  assert.deepEqual(Array.from(auth.AUTH_ROLES), ["guest", "read", "control", "transmit", "write", "administrator"]);
+  assert.equal(auth.hasAuthRole(["guest"], "read"), true);
+  assert.equal(auth.hasAccountControls(["guest"]), false);
+  assert.equal(auth.hasAccountControls(["read"]), true);
   assert.equal(auth.hasAuthRole(["control"], "read"), true);
+  assert.equal(auth.hasAuthRole(["transmit"], "read"), true);
+  assert.equal(auth.hasAuthRole(["control"], "transmit"), false);
   assert.equal(auth.hasAuthRole(["control"], "write"), false);
   assert.equal(auth.hasAuthRole(["administrator"], "write"), true);
 });
diff --git a/src/trx-client/trx-frontend/trx-frontend-http/frontend/tests/bookmarks.test.mjs b/src/trx-client/trx-frontend/trx-frontend-http/frontend/tests/bookmarks.test.mjs
index 72145ef3..d476c61e 100644
--- a/src/trx-client/trx-frontend/trx-frontend-http/frontend/tests/bookmarks.test.mjs
+++ b/src/trx-client/trx-frontend/trx-frontend-http/frontend/tests/bookmarks.test.mjs
@@ -32,7 +32,7 @@ function hostFixture(overrides = {}) {
   const calls = { postPath: [], setRigFrequency: [], armOptimisticFrequency: [], applyLocalTunedFrequency: [], syncBandwidthInput: [], scheduleSpectrumDraw: 0, syncModePicker: 0 };
   const state = {
     authEnabled: false,
-    authRoles: ["read", "control", "write", "administrator"],
+    authRoles: ["read", "control", "transmit", "write", "administrator"],
     lastActiveRigId: null,
     lastRigIds: [],
     lastRigDisplayNames: {},
diff --git a/src/trx-client/trx-frontend/trx-frontend-http/frontend/tests/host-fixture.mjs b/src/trx-client/trx-frontend/trx-frontend-http/frontend/tests/host-fixture.mjs
index 14778877..b2beee1a 100644
--- a/src/trx-client/trx-frontend/trx-frontend-http/frontend/tests/host-fixture.mjs
+++ b/src/trx-client/trx-frontend/trx-frontend-http/frontend/tests/host-fixture.mjs
@@ -19,7 +19,7 @@ export function createHost({ state = {}, core = {}, modules = {} } = {}) {
         serverLat: null,
         serverLon: null,
         authEnabled: false,
-        authRoles: ["read", "control", "write", "administrator"],
+        authRoles: ["read", "control", "transmit", "write", "administrator"],
         lastActiveRigId: null,
         lastRigIds: [],
         lastRigDisplayNames: {},
diff --git a/src/trx-client/trx-frontend/trx-frontend-http/frontend/tests/smoke.test.mjs b/src/trx-client/trx-frontend/trx-frontend-http/frontend/tests/smoke.test.mjs
index 1d2db445..98e503ba 100644
--- a/src/trx-client/trx-frontend/trx-frontend-http/frontend/tests/smoke.test.mjs
+++ b/src/trx-client/trx-frontend/trx-frontend-http/frontend/tests/smoke.test.mjs
@@ -51,6 +51,7 @@ test("account lifecycle controls include self-service passwords and enable state
   assert.match(html, /id="account-password-form"/);
   assert.match(html, /id="user-create-enabled"/);
   assert.match(app, /changeOwnPassword/);
+  assert.match(app, /hasAccountControls\(authRoles\)/);
   assert.match(app, /enabledAdminCount/);
 });
 
diff --git a/src/trx-client/trx-frontend/trx-frontend-http/frontend/tests/transmit-role.mjs b/src/trx-client/trx-frontend/trx-frontend-http/frontend/tests/transmit-role.mjs
new file mode 100644
index 00000000..f2c0cba1
--- /dev/null
+++ b/src/trx-client/trx-frontend/trx-frontend-http/frontend/tests/transmit-role.mjs
@@ -0,0 +1,53 @@
+// SPDX-FileCopyrightText: 2026 Stan Grams <sjg@haxx.space>
+//
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+import assert from "node:assert/strict";
+import { chromium } from "playwright-core";
+import { startBrowser, startWebFixture } from "./web-fixture.mjs";
+
+async function controlState(page) {
+  return {
+    frequency: await page.locator("#freq").isDisabled(),
+    ptt: await page.locator("#ptt-btn").isDisabled(),
+    txAudio: await page.locator("#tx-audio-btn").isDisabled(),
+    txLimit: await page.locator("#tx-limit-btn").isDisabled(),
+  };
+}
+
+async function inspectRole(roles) {
+  const fixture = await startWebFixture({
+    tx: true,
+    authSession: {
+      authenticated: true,
+      username: "operator",
+      roles,
+      auth_disabled: false,
+    },
+  });
+  const session = await startBrowser(chromium);
+  try {
+    await session.page.goto(`${fixture.origin}/`, { waitUntil: "domcontentloaded" });
+    await session.page.locator("#content").waitFor({ state: "visible" });
+    await session.page.waitForTimeout(1200);
+    assert.deepEqual(session.runtimeErrors, []);
+    return await controlState(session.page);
+  } finally {
+    await session.browser.close();
+    await fixture.close();
+  }
+}
+
+assert.deepEqual(await inspectRole(["control"]), {
+  frequency: false,
+  ptt: true,
+  txAudio: true,
+  txLimit: true,
+});
+
+assert.deepEqual(await inspectRole(["transmit"]), {
+  frequency: true,
+  ptt: false,
+  txAudio: false,
+  txLimit: false,
+});
diff --git a/src/trx-client/trx-frontend/trx-frontend-http/frontend/tests/web-fixture.mjs b/src/trx-client/trx-frontend/trx-frontend-http/frontend/tests/web-fixture.mjs
index 6b7a6edd..01f6c254 100644
--- a/src/trx-client/trx-frontend/trx-frontend-http/frontend/tests/web-fixture.mjs
+++ b/src/trx-client/trx-frontend/trx-frontend-http/frontend/tests/web-fixture.mjs
@@ -145,7 +145,7 @@ export async function startWebFixture({
   bandplanEnabled = false,
   bandplanUnauthorizedFirst = false,
   satPasses = null,
-  authSession = { authenticated: true, roles: ["read", "control", "write", "administrator"], auth_disabled: true },
+  authSession = { authenticated: true, roles: ["read", "control", "transmit", "write", "administrator"], auth_disabled: true },
   users = [],
 } = {}) {
   const rigItems = ["rig-a", "rig-b"].map((remote) => ({
diff --git a/src/trx-client/trx-frontend/trx-frontend-http/src/audio.rs b/src/trx-client/trx-frontend/trx-frontend-http/src/audio.rs
index b3f3da87..bb7797b0 100644
--- a/src/trx-client/trx-frontend/trx-frontend-http/src/audio.rs
+++ b/src/trx-client/trx-frontend/trx-frontend-http/src/audio.rs
@@ -737,6 +737,7 @@ pub async fn audio_ws(
     body: web::Payload,
     query: web::Query<AudioQuery>,
     context: web::Data<Arc<FrontendRuntimeContext>>,
+    auth_state: web::Data<crate::server::auth::AuthState>,
 ) -> Result<HttpResponse, Error> {
     let Some(tx_sender) = context.audio.tx.as_ref().cloned() else {
         return Ok(HttpResponse::NotFound().body("audio not enabled"));
@@ -746,6 +747,7 @@ pub async fn audio_ws(
     if !req.headers().contains_key("upgrade") {
         return Ok(HttpResponse::NoContent().finish());
     }
+    let tx_session_id = crate::server::auth::extract_session_id(&req);
 
     // If a channel_id is specified, subscribe to the per-channel broadcaster.
     // The entry is created asynchronously when AUDIO_MSG_VCHAN_ALLOCATED arrives
@@ -880,6 +882,16 @@ pub async fn audio_ws(
                 msg = msg_stream.recv() => {
                     match msg {
                         Some(Ok(Message::Binary(data))) => {
+                            let can_transmit = !auth_state.config.enabled
+                                || crate::server::auth::session_id_grants(
+                                    tx_session_id.as_ref(),
+                                    &auth_state,
+                                    crate::server::auth::AuthRole::Transmit,
+                                );
+                            if !can_transmit {
+                                warn!("Audio WS: closing after unauthorized TX frame");
+                                break;
+                            }
                             let _ = tx_sender.send(Bytes::from(data.to_vec())).await;
                         }
                         Some(Ok(Message::Close(_))) => break,
diff --git a/src/trx-client/trx-frontend/trx-frontend-http/src/auth.rs b/src/trx-client/trx-frontend/trx-frontend-http/src/auth.rs
index 0b87695c..ce291e95 100644
--- a/src/trx-client/trx-frontend/trx-frontend-http/src/auth.rs
+++ b/src/trx-client/trx-frontend/trx-frontend-http/src/auth.rs
@@ -35,8 +35,10 @@ pub type SessionId = String;
 )]
 #[serde(rename_all = "lowercase")]
 pub enum AuthRole {
+    Guest,
     Read,
     Control,
+    Transmit,
     Write,
     Administrator,
 }
@@ -44,23 +46,32 @@ pub enum AuthRole {
 impl AuthRole {
     pub fn as_str(&self) -> &'static str {
         match self {
+            Self::Guest => "guest",
             Self::Read => "read",
             Self::Control => "control",
+            Self::Transmit => "transmit",
             Self::Write => "write",
             Self::Administrator => "administrator",
         }
     }
 
-    pub fn all() -> BTreeSet<Self> {
-        [Self::Read, Self::Control, Self::Write, Self::Administrator]
-            .into_iter()
-            .collect()
+    pub fn full_access() -> BTreeSet<Self> {
+        [
+            Self::Read,
+            Self::Control,
+            Self::Transmit,
+            Self::Write,
+            Self::Administrator,
+        ]
+        .into_iter()
+        .collect()
     }
 
     fn grants(self, required: Self) -> bool {
         self == Self::Administrator
             || self == required
-            || self == Self::Control && required == Self::Read
+            || self == Self::Guest && required == Self::Read
+            || matches!(self, Self::Control | Self::Transmit) && required == Self::Read
     }
 }
 
@@ -74,9 +85,13 @@ fn roles_grant_any(roles: &AuthRoles, required: &[AuthRole]) -> bool {
     required.iter().any(|role| roles_grant(roles, *role))
 }
 
+fn roles_allow_account_controls(roles: &AuthRoles) -> bool {
+    !roles.contains(&AuthRole::Guest)
+}
+
 fn effective_roles(roles: &AuthRoles) -> Vec<AuthRole> {
     if roles.contains(&AuthRole::Administrator) {
-        AuthRole::all().into_iter().collect()
+        AuthRole::full_access().into_iter().collect()
     } else {
         roles.iter().copied().collect()
     }
@@ -311,7 +326,7 @@ impl<'de> Deserialize<'de> for UserRecord {
         let roles = match (stored.roles, stored.role) {
             (Some(roles), _) => roles,
             (None, Some(LegacyRole::User)) => [AuthRole::Read].into_iter().collect(),
-            (None, Some(LegacyRole::Admin)) => AuthRole::all(),
+            (None, Some(LegacyRole::Admin)) => AuthRole::full_access(),
             (None, None) => {
                 return Err(serde::de::Error::missing_field("roles"));
             }
@@ -390,7 +405,7 @@ impl UserStore {
             let mut records = vec![UserRecord {
                 username: validate_username(&administrator.username)?.to_string(),
                 password_hash: hash_password(&administrator.password)?,
-                roles: AuthRole::all(),
+                roles: AuthRole::full_access(),
                 enabled: true,
             }];
             if let Some(reader) = &config.bootstrap_read {
@@ -405,7 +420,7 @@ impl UserStore {
                 records.push(UserRecord {
                     username: validate_username(&reader.username)?.to_string(),
                     password_hash: hash_password_value(&reader.password)?,
-                    roles: [AuthRole::Read].into_iter().collect(),
+                    roles: [AuthRole::Guest].into_iter().collect(),
                     enabled: true,
                 });
             }
@@ -617,6 +632,9 @@ fn validate_roles(roles: AuthRoles) -> Result<AuthRoles, String> {
     if roles.is_empty() {
         return Err("at least one role is required".to_string());
     }
+    if roles.contains(&AuthRole::Guest) && roles.len() != 1 {
+        return Err("guest cannot be combined with other roles".to_string());
+    }
     Ok(roles)
 }
 
@@ -766,7 +784,7 @@ pub struct ChangePasswordRequest {
 }
 
 /// Extract session from cookie
-fn extract_session_id(req: &HttpRequest) -> Option<SessionId> {
+pub fn extract_session_id(req: &HttpRequest) -> Option<SessionId> {
     req.cookie("trx_http_sid")
         .map(|cookie| cookie.value().to_string())
 }
@@ -779,7 +797,18 @@ pub fn get_session_roles(req: &HttpRequest, auth_state: &AuthState) -> Option<Au
 }
 
 pub fn session_grants(req: &HttpRequest, auth_state: &AuthState, role: AuthRole) -> bool {
-    get_session_roles(req, auth_state).is_some_and(|roles| roles_grant(&roles, role))
+    let session_id = extract_session_id(req);
+    session_id_grants(session_id.as_ref(), auth_state, role)
+}
+
+pub fn session_id_grants(
+    session_id: Option<&SessionId>,
+    auth_state: &AuthState,
+    role: AuthRole,
+) -> bool {
+    session_id
+        .and_then(|id| auth_state.store.get(id))
+        .is_some_and(|session| roles_grant(&session.roles, role))
 }
 
 fn require_session(
@@ -812,6 +841,19 @@ fn require_admin(req: &HttpRequest, auth_state: &AuthState) -> Result<SessionRec
     require_role(req, auth_state, AuthRole::Administrator)
 }
 
+fn require_account_controls(
+    req: &HttpRequest,
+    auth_state: &AuthState,
+) -> Result<SessionRecord, HttpResponse> {
+    let session = require_session(req, auth_state)?;
+    if !roles_allow_account_controls(&session.roles) {
+        return Err(HttpResponse::Forbidden().json(serde_json::json!({
+            "error":"guest accounts cannot access account controls"
+        })));
+    }
+    Ok(session)
+}
+
 fn session_cookie(value: String, config: &AuthConfig, max_age: Duration) -> Cookie<'static> {
     let mut cookie = Cookie::new("trx_http_sid", value);
     cookie.set_path("/");
@@ -925,7 +967,7 @@ pub async fn session_status(
     if !auth_state.config.enabled {
         return Ok(HttpResponse::Ok().json(SessionStatus {
             authenticated: true,
-            roles: effective_roles(&AuthRole::all()),
+            roles: effective_roles(&AuthRole::full_access()),
             username: None,
             auth_disabled: true,
         }));
@@ -958,7 +1000,7 @@ pub async fn change_own_password(
     body: web::Json<ChangePasswordRequest>,
     auth_state: web::Data<AuthState>,
 ) -> impl Responder {
-    let session = match require_session(&req, &auth_state) {
+    let session = match require_account_controls(&req, &auth_state) {
         Ok(value) => value,
         Err(response) => return response,
     };
@@ -1086,16 +1128,18 @@ pub async fn delete_user(
 enum RouteAccess {
     /// Publicly accessible (no auth required)
     Public,
-    /// Any valid account session.
-    Authenticated,
-    /// Read-only resources (Read, Control, or Administrator required)
+    /// Account controls are available to non-guest sessions.
+    Account,
+    /// Read-only resources (Guest, Read, Control, or Administrator required)
     Read,
-    /// Bookmarks (Read, Control, Write, or Administrator required)
+    /// Bookmarks (Guest, Read, Control, Transmit, Write, or Administrator required)
     ReadWrite,
     /// Logbook access (Write or Administrator required)
     Write,
     /// Radio control (Control or Administrator required)
     Control,
+    /// Transmit actions (Transmit or Administrator required)
+    Transmit,
     /// Managed-account administration.
     Administrator,
 }
@@ -1118,11 +1162,14 @@ impl RouteAccess {
         }
 
         if path == "/auth/account/password" {
-            return Self::Authenticated;
+            return Self::Account;
         }
         if path == "/auth/users" || path.starts_with("/auth/users/") {
             return Self::Administrator;
         }
+        if path == "/set_ptt" || path == "/set_tx_limit" {
+            return Self::Transmit;
+        }
 
         // Static assets.  The band plan is one of them: it is compiled into the
         // binary and identical for every user, but ".json" is not an asset
@@ -1177,12 +1224,13 @@ impl RouteAccess {
     fn allows(&self, roles: Option<&AuthRoles>) -> bool {
         match self {
             Self::Public => true,
-            Self::Authenticated => roles.is_some(),
+            Self::Account => roles.is_some_and(roles_allow_account_controls),
             Self::Read => roles.is_some_and(|roles| roles_grant(roles, AuthRole::Read)),
             Self::ReadWrite => roles
                 .is_some_and(|roles| roles_grant_any(roles, &[AuthRole::Read, AuthRole::Write])),
             Self::Write => roles.is_some_and(|roles| roles_grant(roles, AuthRole::Write)),
             Self::Control => roles.is_some_and(|roles| roles_grant(roles, AuthRole::Control)),
+            Self::Transmit => roles.is_some_and(|roles| roles_grant(roles, AuthRole::Transmit)),
             Self::Administrator => {
                 roles.is_some_and(|roles| roles_grant(roles, AuthRole::Administrator))
             }
@@ -1319,7 +1367,7 @@ mod tests {
         assert_eq!(RouteAccess::from_path("/auth/logout"), RouteAccess::Public);
         assert_eq!(
             RouteAccess::from_path("/auth/account/password"),
-            RouteAccess::Authenticated
+            RouteAccess::Account
         );
         assert_eq!(
             RouteAccess::from_path("/auth/users"),
@@ -1356,23 +1404,33 @@ mod tests {
             RouteAccess::Control
         );
         assert_eq!(RouteAccess::from_path("/set_mode"), RouteAccess::Control);
+        assert_eq!(RouteAccess::from_path("/set_ptt"), RouteAccess::Transmit);
+        assert_eq!(
+            RouteAccess::from_path("/set_tx_limit"),
+            RouteAccess::Transmit
+        );
     }
 
     #[test]
     fn test_route_access_allows() {
+        let guest = roles(&[AuthRole::Guest]);
         let read = roles(&[AuthRole::Read]);
         let control = roles(&[AuthRole::Control]);
+        let transmit = roles(&[AuthRole::Transmit]);
         let write = roles(&[AuthRole::Write]);
         let administrator = roles(&[AuthRole::Administrator]);
         assert!(RouteAccess::Public.allows(None));
         assert!(RouteAccess::Public.allows(Some(&read)));
         assert!(RouteAccess::Public.allows(Some(&administrator)));
-        assert!(!RouteAccess::Authenticated.allows(None));
-        assert!(RouteAccess::Authenticated.allows(Some(&write)));
+        assert!(!RouteAccess::Account.allows(None));
+        assert!(!RouteAccess::Account.allows(Some(&guest)));
+        assert!(RouteAccess::Account.allows(Some(&write)));
 
         assert!(!RouteAccess::Read.allows(None));
+        assert!(RouteAccess::Read.allows(Some(&guest)));
         assert!(RouteAccess::Read.allows(Some(&read)));
         assert!(RouteAccess::Read.allows(Some(&control)));
+        assert!(RouteAccess::Read.allows(Some(&transmit)));
         assert!(!RouteAccess::Read.allows(Some(&write)));
         assert!(RouteAccess::Read.allows(Some(&administrator)));
 
@@ -1387,7 +1445,11 @@ mod tests {
         assert!(!RouteAccess::Control.allows(None));
         assert!(!RouteAccess::Control.allows(Some(&read)));
         assert!(RouteAccess::Control.allows(Some(&control)));
+        assert!(!RouteAccess::Control.allows(Some(&transmit)));
         assert!(RouteAccess::Control.allows(Some(&administrator)));
+        assert!(!RouteAccess::Transmit.allows(Some(&control)));
+        assert!(RouteAccess::Transmit.allows(Some(&transmit)));
+        assert!(RouteAccess::Transmit.allows(Some(&administrator)));
         assert!(!RouteAccess::Administrator.allows(Some(&control)));
         assert!(RouteAccess::Administrator.allows(Some(&administrator)));
     }
@@ -1416,6 +1478,28 @@ mod tests {
         assert!(store.get(&session_id).is_none());
     }
 
+    #[test]
+    fn transmit_grant_tracks_live_session_revocation() {
+        let directory = tempfile::tempdir().unwrap();
+        let state = AuthState::new(test_auth_config(directory.path().join("users.json"))).unwrap();
+        let session_id = state.store.create(
+            "operator".to_string(),
+            roles(&[AuthRole::Transmit]),
+            Duration::from_secs(3600),
+        );
+        assert!(session_id_grants(
+            Some(&session_id),
+            &state,
+            AuthRole::Transmit
+        ));
+        state.store.remove(&session_id);
+        assert!(!session_id_grants(
+            Some(&session_id),
+            &state,
+            AuthRole::Transmit
+        ));
+    }
+
     #[test]
     fn user_store_bootstraps_and_manages_users() {
         let directory = tempfile::tempdir().unwrap();
@@ -1423,12 +1507,12 @@ mod tests {
         let users = UserStore::open(&config).unwrap();
         assert_eq!(
             users.authenticate("admin", "password123"),
-            Some(AuthRole::all())
+            Some(AuthRole::full_access())
         );
         assert_eq!(users.authenticate("admin", "wrong"), None);
         assert_eq!(
             users.authenticate("guest", "guest"),
-            Some(roles(&[AuthRole::Read]))
+            Some(roles(&[AuthRole::Guest]))
         );
         users
             .add("alice", "password456", roles(&[AuthRole::Read]), true)
@@ -1438,11 +1522,16 @@ mod tests {
             Some(roles(&[AuthRole::Read]))
         );
         users
-            .update("alice", Some("password789"), Some(AuthRole::all()), None)
+            .update(
+                "alice",
+                Some("password789"),
+                Some(AuthRole::full_access()),
+                None,
+            )
             .unwrap();
         assert_eq!(
             users.authenticate("alice", "password789"),
-            Some(AuthRole::all())
+            Some(AuthRole::full_access())
         );
         users.remove("admin").unwrap();
         assert_eq!(users.list().len(), 2);
@@ -1453,7 +1542,7 @@ mod tests {
         let reopened = UserStore::open(&reopen_config).unwrap();
         assert_eq!(
             reopened.authenticate("alice", "password789"),
-            Some(AuthRole::all())
+            Some(AuthRole::full_access())
         );
         let database = fs::read_to_string(&reopen_config.users_file).unwrap();
         assert!(database.contains("$argon2"));
@@ -1500,6 +1589,15 @@ mod tests {
         assert_eq!(users.authenticate("guest", "guest"), None);
     }
 
+    #[test]
+    fn guest_is_an_exclusive_role() {
+        assert_eq!(
+            validate_roles(roles(&[AuthRole::Guest])).unwrap(),
+            roles(&[AuthRole::Guest])
+        );
+        assert!(validate_roles(roles(&[AuthRole::Guest, AuthRole::Read])).is_err());
+    }
+
     #[test]
     fn legacy_single_roles_are_migrated() {
         let read: UserRecord = serde_json::from_value(serde_json::json!({
@@ -1517,7 +1615,7 @@ mod tests {
 
         assert_eq!(read.roles, roles(&[AuthRole::Read]));
         assert!(read.enabled);
-        assert_eq!(administrator.roles, AuthRole::all());
+        assert_eq!(administrator.roles, AuthRole::full_access());
         assert!(administrator.enabled);
         assert!(serde_json::to_value(administrator)
             .unwrap()
@@ -1743,11 +1841,15 @@ mod tests {
     }
 
     #[actix_web::test]
-    async fn users_can_change_their_own_password() {
+    async fn non_guest_users_can_change_their_own_password() {
         let directory = tempfile::tempdir().unwrap();
         let state = web::Data::new(
             AuthState::new(test_auth_config(directory.path().join("users.json"))).unwrap(),
         );
+        state
+            .users
+            .add("reader", "reader-password", roles(&[AuthRole::Read]), true)
+            .unwrap();
         let app = aw_test::init_service(
             App::new()
                 .app_data(state)
@@ -1760,16 +1862,16 @@ mod tests {
             &app,
             aw_test::TestRequest::post()
                 .uri("/auth/login")
-                .set_json(serde_json::json!({"username":"guest","password":"guest"}))
+                .set_json(serde_json::json!({"username":"reader","password":"reader-password"}))
                 .to_request(),
         )
         .await;
-        let guest_cookie = response.response().cookies().next().unwrap().to_string();
+        let reader_cookie = response.response().cookies().next().unwrap().to_string();
 
         let change = |current: &str, new: &str| {
             aw_test::TestRequest::patch()
                 .uri("/auth/account/password")
-                .insert_header((actix_web::http::header::COOKIE, guest_cookie.clone()))
+                .insert_header((actix_web::http::header::COOKIE, reader_cookie.clone()))
                 .set_json(serde_json::json!({
                     "current_password":current,"new_password":new
                 }))
@@ -1782,7 +1884,7 @@ mod tests {
             actix_web::http::StatusCode::FORBIDDEN
         );
         assert_eq!(
-            aw_test::call_service(&app, change("guest", "new-password"))
+            aw_test::call_service(&app, change("reader-password", "new-password"))
                 .await
                 .status(),
             actix_web::http::StatusCode::OK
@@ -1791,7 +1893,7 @@ mod tests {
             &app,
             aw_test::TestRequest::get()
                 .uri("/auth/session")
-                .insert_header((actix_web::http::header::COOKIE, guest_cookie))
+                .insert_header((actix_web::http::header::COOKIE, reader_cookie))
                 .to_request(),
         )
         .await;
@@ -1801,7 +1903,7 @@ mod tests {
                 &app,
                 aw_test::TestRequest::post()
                     .uri("/auth/login")
-                    .set_json(serde_json::json!({"username":"guest","password":"new-password"}))
+                    .set_json(serde_json::json!({"username":"reader","password":"new-password"}))
                     .to_request(),
             )
             .await
@@ -1809,4 +1911,40 @@ mod tests {
             actix_web::http::StatusCode::OK
         );
     }
+
+    #[actix_web::test]
+    async fn guest_cannot_change_account_password() {
+        let directory = tempfile::tempdir().unwrap();
+        let state = web::Data::new(
+            AuthState::new(test_auth_config(directory.path().join("users.json"))).unwrap(),
+        );
+        let app = aw_test::init_service(
+            App::new()
+                .app_data(state)
+                .service(login)
+                .service(change_own_password),
+        )
+        .await;
+        let response = aw_test::call_service(
+            &app,
+            aw_test::TestRequest::post()
+                .uri("/auth/login")
+                .set_json(serde_json::json!({"username":"guest","password":"guest"}))
+                .to_request(),
+        )
+        .await;
+        let guest_cookie = response.response().cookies().next().unwrap().to_string();
+        let response = aw_test::call_service(
+            &app,
+            aw_test::TestRequest::patch()
+                .uri("/auth/account/password")
+                .insert_header((actix_web::http::header::COOKIE, guest_cookie))
+                .set_json(serde_json::json!({
+                    "current_password":"guest","new_password":"new-password"
+                }))
+                .to_request(),
+        )
+        .await;
+        assert_eq!(response.status(), actix_web::http::StatusCode::FORBIDDEN);
+    }
 }
diff --git a/src/trx-config/src/client.rs b/src/trx-config/src/client.rs
index c4e8440a..92c9fa02 100644
--- a/src/trx-config/src/client.rs
+++ b/src/trx-config/src/client.rs
@@ -277,11 +277,11 @@ pub struct HttpAuthConfig {
     /// Read the bootstrap administrator password from this file instead.
     #[serde(default, skip_serializing_if = "Option::is_none")]
     pub bootstrap_admin_password_file: Option<String>,
-    /// Create a read-only account when bootstrapping a new database.
+    /// Create a Guest account when bootstrapping a new database.
     pub bootstrap_read_enabled: bool,
-    /// Username for the read-only bootstrap account.
+    /// Username for the Guest bootstrap account.
     pub bootstrap_read_username: String,
-    /// Password for the read-only bootstrap account.
+    /// Password for the Guest bootstrap account.
     pub bootstrap_read_password: Option<String>,
     /// Session time-to-live in minutes
     pub session_ttl_min: u64,
@@ -989,7 +989,7 @@ fn validate_http_auth(auth: &HttpAuthConfig) -> Result<(), String> {
                 .as_deref()
                 .is_none_or(str::is_empty))
     {
-        return Err("[frontends.http.auth] enabled bootstrap read account requires a non-empty username and password".to_string());
+        return Err("[frontends.http.auth] enabled bootstrap Guest account requires a non-empty username and password".to_string());
     }
 
     // Session TTL must be > 0