FTM-400 / APRS Text Messages
APRS Text messages in the Yaesu radios are not saved to permanent memory.I am referring to those described on page 48 of the APRS manual for the FTM-400 (I would think there are comparable descriptions in the other APRS manuals) . This is a continually changing list of sent and received messages. Once it fills to 100, the oldest messages are deleted automatically to make room for receipt of a new message.
These messages cannot be edited through the programmer since the power off/on sequence needed by that process will clear the list. There are 8 Text Message memories that can be saved. Access them in the program at Settings | Radio Menu Settings | APRS | Text Messges.
APRS Text Messages 08/26/2020