[J6Niner]

I have a Magellan Meridian Platinum (several years old) for off-roading and mountain biking. This gps also does street routing with appropriate software. Easy to trace your offroad routes and back-track.

I also have a Lowrance iWay 350c for street routing. Very slick unit that displays pics and plays mp3s from a sd card. Gives you audible turn by turn directions that can be heard over the car stereo via built-in FM transmitter.

Both of these will run off batteries (Magellan is 2 AA and Lowrance is built-in Lion)... and were much cheaper than factory or aftermarket head units.