Any recommendations from anyone on a cheap GPS unit that could be used for this Geocaching and navigation in the car. Seems like Walmart and other stores have handheld units for around $100. Also, I'm starting to see cell phones with GPS enabled for sale, would these work?

M80s VP180 4xM22ow 4xM3ic EP600 2xEP350
AnthemAVM60 Outlaw7700 EmoA500 Epson5040UB FluanceRT85