Before you begin you must select a starting 'unit' in the station list.
The program will use this 'unit' and the following to show APRS. When the end of list is reached, the program will start over at the first 'unit' checked. Do not check all units as in that case all prior set units will be lost.
In this example units 40, 41, until 49 and mobile will be used to rotate the received APRS stations.