AvMap APRS - Manual (Page 10)

Geosat 6 APRS can auto-delete the received APRS
contacts positions based on a user defined timeout. You
can also sort your APRS contacts based on alphabetical
order or received time. Touch the Options button in the
APRS menu.
Contacts sorting:
Touch Contact sorting, and then choose to sort the APRS
Folder based on call sign or date-time.
Contacts Timeout:
Touch Contacts timeout and choose to automatically
delete contacts from the APRS Contacts Folder based
on selected time period. It is important to have your
time correctly set on your TNC/Radio and on your AvMap
Geosat 6 APRS
V. Managing APRS contacts
10 - AvMap