Lost hikers and outdoorsmen will soon have yet another arrow to add to their navigational quivers, now that Garmin has decided to upgrade its eTrex line of GPS handhelds. The refresh, announced this morning, will bring three new models to the eTrex family during the third quarter of this year. First up is the eTrex 10 -- a basic, $120 little guy that carries a global database of locations, as well as a monochrome display that can be read under the sun. The $200 eTrex 20, on the other hand, displays images in 65k color on a 2.2-inch screen and can support topographic, roadway and marine maps. At the
