I have a Garmin Gekko ... 50 bucks on sale. I used it to trace my speed and distance while running on the trail - on foot - and it did all it was suppossed to do. No downloads, no recahrgeable batteries, but very reliable. I preprogrammed waypoints for car trips I have done, and it is accurate -with a clear sky - withing 3 feet.I would spot the middle of the ramp, so the arrow would point in the direction of the exit on the interstate, and it has done so flawlessly. It is a little labor intensive to program the bugger, but for 50 bucks I got a heck of a deal with it. The altimeter is slow but it works well and accuratelly as weel. All in all I am plenty satisfied with the little bugger.
Low tech GPS .... who would think that it would be possible?