eTrex Vista has enough map detail to help you get out of town, with an electronic compass & barometric altimeter.

Technical Specifications
Battery life:12 hours on 2AAs, waterproof , IPX7 - submersible, Routes/waypoints/icons:20/500/yes, Grids: MGRS, UTM, OSGB, Display size/resolution:2.7 x 5.4cm (160 x 288 pixels)

Special Features
WAAS enabled & 24 MB internal memory for storing map data from the Garmap CD-ROM