More bugfixes in comment offsets

src/frame.ts

@@ -822,7 +822,7 @@ export class Frame implements IFrame {
         }
 
         // remove altitude token from ext and advance ext for further parsing
-        commentOffset += 7;
+        commentOffset += altMatch[0].length;
         ext = ext.replace(altMatch[0], "").trimStart();
 
         continue;

test/frame.extras.test.ts

@@ -6,6 +6,26 @@ import type { PositionPayload } from "../src/frame.types";
 import { feetToMeters, milesToMeters } from "../src/parser";
 
 describe("APRS extras test vectors", () => {
+  it("parses altitude token in the beginning of a comment and emits structure", () => {
+    const raw =
+      "DL3QP-R>APDG03,TCPIP*,qAC,T2ROMANIA:!5151.12ND00637.65E&/A=000000440 MMDVM Voice 439.40000MHz -7.6000MHz, DL3QP_Pi-Star";
+    const frame = Frame.fromString(raw);
+    const res = frame.decode(true) as { payload: PositionPayload | null; structure: Dissected };
+    const { payload, structure } = res;
+
+    expect(payload).not.toBeNull();
+    // Altitude 001234 ft -> meters
+    expect(payload!.position.altitude).toBe(0);
+
+    const commentSeg = structure.find((s) => /comment/i.test(String(s.name))) as Segment | undefined;
+    expect(commentSeg).toBeDefined();
+    const fieldsAlt = (commentSeg!.fields ?? []) as Field[];
+    const hasAlt = fieldsAlt.some((f) => f.name === "altitude");
+    expect(hasAlt).toBe(true);
+
+    expect(payload!.position.comment).toBe("440 MMDVM Voice 439.40000MHz -7.6000MHz, DL3QP_Pi-Star");
+  });
+
   it("parses altitude token marker mid-comment and emits structure", () => {
     const raw = "N0CALL>APRS,WIDE1-1:!4500.00N/07000.00W#RNG0001ALT/A=001234 Your Comment Here";
     const frame = Frame.fromString(raw);