I have the basic Garmin eTrex and like it, although my needs are limited. It costs about $100 and uses AA batteries. It will work is a vehicle if placed on the dash where it can "see" through the windshield. It won't utilize maps, though. However it is exceedingly easy to use, which is great for me as my aptitude is limited by my patience, I guess might be a good way to put it. My main desire was simply something to use while hunting or hiking in the woods and get back where I started. No real sophisticated desires.