I had the basic E-trex for years and it saved my bacon more than once finding my way back to my truck in the freaking blizzards after dark, worth its weight in gold, although it didn't have any base map it recorded tracks and did the job, well it got stolen along with the rest of my gear and I ended up getting a Garman Etrex 30, a bit more bells and whistles than I needed, seems to be geared for geo-caching. But I managed to load a lot of free maps from Base camp and have to say its turned in to a great tool, recording routes with the ability to add photos and commentary to your hunt, hike or what ever, I assume the 20 operates similar with a few less options.