diff --git a/src/trx-client/trx-frontend/trx-frontend-http/assets/web/plugins/background-decode.js b/src/trx-client/trx-frontend/trx-frontend-http/assets/web/plugins/background-decode.js
index 5318fd1..1d1872a 100644
--- a/src/trx-client/trx-frontend/trx-frontend-http/assets/web/plugins/background-decode.js
+++ b/src/trx-client/trx-frontend/trx-frontend-http/assets/web/plugins/background-decode.js
@@ -111,11 +111,16 @@
 
   function bookmarkDecoderKinds(bookmark) {
     const decoders = Array.isArray(bookmark && bookmark.decoders) ? bookmark.decoders : [];
-    return decoders
+    const supported = decoders
       .map(function (item) { return String(item || "").trim().toLowerCase(); })
       .filter(function (item, index, arr) {
         return SUPPORTED_DECODERS.includes(item) && arr.indexOf(item) === index;
       });
+    if (supported.length > 0) return supported;
+    const mode = String(bookmark && bookmark.mode || "").trim().toUpperCase();
+    if (mode === "AIS") return ["ais"];
+    if (mode === "PKT") return ["aprs"];
+    return supported;
   }
 
   function renderBookmarkPick() {
diff --git a/src/trx-client/trx-frontend/trx-frontend-http/src/background_decode.rs b/src/trx-client/trx-frontend/trx-frontend-http/src/background_decode.rs
index 7d6eada..6e9f5e1 100644
--- a/src/trx-client/trx-frontend/trx-frontend-http/src/background_decode.rs
+++ b/src/trx-client/trx-frontend/trx-frontend-http/src/background_decode.rs
@@ -210,7 +210,7 @@ impl BackgroundDecodeManager {
                         freq_hz: bookmark.map(|item| item.freq_hz),
                         mode: bookmark.map(|item| item.mode.clone()),
                         decoder_kinds: bookmark
-                            .map(|item| supported_decoder_kinds(&item.decoders))
+                            .map(bookmark_supported_decoder_kinds)
                             .unwrap_or_default(),
                         state: "inactive".to_string(),
                         channel_kind: None,
@@ -345,7 +345,7 @@ impl BackgroundDecodeManager {
                 continue;
             };
 
-            let decoder_kinds = supported_decoder_kinds(&bookmark.decoders);
+            let decoder_kinds = bookmark_supported_decoder_kinds(bookmark);
             let mut status = BackgroundDecodeBookmarkStatus {
                 bookmark_id: bookmark.id.clone(),
                 bookmark_name: Some(bookmark.name.clone()),
@@ -525,6 +525,19 @@ fn supported_decoder_kinds(decoders: &[String]) -> Vec<String> {
     out
 }
 
+fn bookmark_supported_decoder_kinds(bookmark: &Bookmark) -> Vec<String> {
+    let explicit = supported_decoder_kinds(&bookmark.decoders);
+    if !explicit.is_empty() {
+        return explicit;
+    }
+
+    match bookmark.mode.trim().to_ascii_uppercase().as_str() {
+        "AIS" => vec!["ais".to_string()],
+        "PKT" => vec!["aprs".to_string()],
+        _ => Vec::new(),
+    }
+}
+
 fn channel_matches_bookmark(channel: &ClientChannel, bookmark: &Bookmark) -> bool {
     channel.freq_hz == bookmark.freq_hz && normalized_mode(&channel.mode) == normalized_mode(&bookmark.mode)
 }