Because the Yaesu FTM-200 is a single receiver transceiver, when operating in it's pseudo dual receive mode, it cuts away from the main frequency to check for activity on the second frequency.
It's the only way you can operate APRS and monitor a repeater. However, it's also annoying.
The easy work around is to disable dual receive with a function key on the mic when someone calls you on the main voice frequency.
This stops the annoying interruptions and APRS reporting. When the conversation is over pressing the key returns to the dual receive mode and APRS function resumes.
Using the FTM-200's menu item #27 you want to select the "DW" option for key 2, 3 or 4. Save it.
That's it!? ?Now when you press the function key you selected, it will toggle dual receive mode.
73
Mike
N0QBH Mike Berg