I carry a Garmin Rino (FRS/GMRS radio plus GPS) and I occasionally lose signal in the woods. But I've never had to move more than 20 feet to reacquire it so I don't consider that too much of a problem. The real PITB with a GPS is that you have to be moving to use it. That's why I carry a Tru-Nord and a Brunton map compass.

Regards, Vince