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The appendage is the message sequence number, indicating that your station is expecting an acknowledgment from the recipient. Note that the number is increasing with each subsequent message, so the messages can be told apart.

The details are in the APRS Protocol Specification.

Andrew, KA2DDO
author of YAAC

________________________________________
From: yaac-users@groups.io <yaac-users@groups.io> on behalf of Michael WA7SKG <wa7skg@...>
Sent: Monday, February 26, 2024 12:57 PM
To: yaac-users@groups.io
Subject: [yaac-users] Strange addition to message

I am testing using APRS for POTA spots.

TO: POTAGW Via: MSG: WA7SKG K-TEST 146.520 FM VIA APRS

Over the air, the message says "VIA APRS{m000b"
Subsequent messages have appended {m000c, {m000d, {m000e, etc. What is
this string for? Why is it appended to my messages?


--
73,
Michael WA7SKG

"Any day you do not learn one new thing is a wasted day."