I just saw an ad last night in my Backpacker magazine for the Garmin Rino GPS - its an FRS & GMRS radio with GPS receiver (or a GPS receiver with built in FRS & GMRS radio, depending how you look at it)

I checked it out online - the good one has mapping for North and South America with cities, highways, street level, topomaps, etc etc and it can be had for less than $300.

If two users are using these radios with eachother, the location of user A will appear on user B's map on their Rino. That is sweet!

Oh, check the info out here.