Update on my previous post....the D700A and the Garmin GPSIII+ are working grear together. Easy hook up. The D700A is very easy to program, all menus are very clear and logical. This set up is very good and allowed me to get on APRS very quickly.
The suggestion of going to the TAPR site was very good. I would recommend viewing that site first.
73
Fritz
WD9FMB