diff --git a/src/trx-client/trx-frontend/trx-frontend-http/assets/web/style.css b/src/trx-client/trx-frontend/trx-frontend-http/assets/web/style.css
index 3d38895c..a6e484d9 100644
--- a/src/trx-client/trx-frontend/trx-frontend-http/assets/web/style.css
+++ b/src/trx-client/trx-frontend/trx-frontend-http/assets/web/style.css
@@ -1839,11 +1839,17 @@ small { color: var(--text-muted); }
   font-size: 0.82rem;
   color: var(--text-muted);
 }
+/* Full-bleed: break the map panel out of the centred .card column so the
+   stage spans the whole viewport width. The negative inline margins cancel
+   the card's centring offset plus its side padding, whatever they are. */
 #tab-map {
   display: flex;
   flex-direction: column;
   min-height: 0;
   gap: 0.85rem;
+  width: 100vw;
+  max-width: 100vw;
+  margin-inline: calc(50% - 50vw);
 }
 /* map-loading uses the shared .decode-history-overlay .content-overlay classes */
 #map-stage {
@@ -1851,8 +1857,9 @@ small { color: var(--text-muted); }
   flex: 0 1 auto;
   min-height: 0;
   overflow: hidden;
-  border-radius: 6px;
+  border-radius: 0;
   border: 1px solid color-mix(in srgb, var(--border-light) 78%, transparent);
+  border-inline: 0;
   background:
     linear-gradient(180deg, color-mix(in srgb, var(--card-bg) 86%, transparent), color-mix(in srgb, var(--card-bg) 64%, transparent)),
     color-mix(in srgb, var(--input-bg) 88%, transparent);
diff --git a/src/trx-client/trx-frontend/trx-frontend-http/frontend/tests/browser-smoke.mjs b/src/trx-client/trx-frontend/trx-frontend-http/frontend/tests/browser-smoke.mjs
index 766a9400..c0ea07f8 100644
--- a/src/trx-client/trx-frontend/trx-frontend-http/frontend/tests/browser-smoke.mjs
+++ b/src/trx-client/trx-frontend/trx-frontend-http/frontend/tests/browser-smoke.mjs
@@ -203,6 +203,22 @@ try {
   await page.locator('.tab[data-tab="map"]').click();
   await page.locator("#aprs-map .leaflet-pane").first().waitFor({ state: "attached" });
   assert.equal(new URL(page.url()).pathname, "/map");
+
+  // The map is full-bleed: it breaks out of the centred .card column and
+  // reaches both viewport edges, without pushing the page sideways.
+  const stage = await page.evaluate(() => {
+    const rect = document.getElementById("map-stage").getBoundingClientRect();
+    return {
+      left: Math.round(rect.left),
+      right: Math.round(rect.right),
+      viewport: document.documentElement.clientWidth,
+      sideways: document.documentElement.scrollWidth > document.documentElement.clientWidth + 1,
+    };
+  });
+  assert.equal(stage.left, 0, `map stage starts at ${stage.left}px, not the viewport edge`);
+  assert.equal(stage.right, stage.viewport, `map stage ends at ${stage.right}px, not ${stage.viewport}px`);
+  assert.equal(stage.sideways, false, "full-bleed map makes the page scroll sideways");
+
   await page.locator('.tab[data-tab="main"]').click();
   assert.equal(new URL(page.url()).pathname, "/");