I will be purchasing a pair of Rinos soon and need input on these models... there are 3 differences I can see: 1. 655 is $100 more 2. 655 comes with a (preloaded??) 100k map 3. 655 has a 5mp camera I have had and used the Garmin series for several yrs but let one of the kids use it and now its lost... when I did use it, I downloaded the free AZ topo map from gpsfile depot and it worked great. Only prob I remember was I couldn't get the whole state on the unit and if I wanted to change the map I would lose my waypoints. I have an elk hunt in NM and deer in AZ and would like to keep all my waypoints using the best/most detailed maps available. also, are these rinos like the typical radios that only work if your within site of the other guy?