Garmin hopes to entice hikers and geocache hunters alike with its new eTrex pocketable GPS device range. First up to bat is the eTrex 10, armed with a sunlight-readable monochrome display and worldwide basemap, starting at only £110. The eTrex 20 and 30 both offer detailed topographic marine and road maps, with the ability to load additional ordinance survey data. The eTrex 30 also packs in an three-axis electronic compass which should come in handy for finding even the most gravitationally-challenged treasure locations. The eTrex 20 and 30 will set you back £180 and £230 respectively and all models will available in the next few months. Happy hunting.