Re: Garmin Rino 655t vs 650
I have the 655T. Having the preloaded topo map is pretty nice but if I were to do it all over again, I would get the 650 and buy the HuntingGPSMaps.com SD card. I ended up buynig one for my 655T and now I don't use the preloaded map at all.
The radios work pretty well. You don't have to be line of sight but the same side of the mountain is almost a requirement. I was approximately 4 miles away from my brother who also has one. We were on the same side of the mountain, separated by several ridges and I was able to hear him fine.
In short, buy it...I'm glad I did. I really enjoy using mine.