This GPS unit was just about the best oudoor unit you could get when I bought it back in 2006. I've used the hell out of it for 6 years and it still runs like a champ. Recently bought the top of the line Garmin, so I'm letting it go for a fraction of what I paid for it. Rugged and waterproof. Runs off of 2 AA batteries or car adapter. Not sure if car adapter still works, but Lowrance still sells em. All manuals, SD card reader/writer, car adapter & 6 CD set topo mapping program for entire continental US included. Mapping program includes more features than I ever knew what to do with it. Land based topographic contour lines, hunting mode, points of interest, marine navigation & obstructions, etc. I have a 1-GB SD card loaded with all of Washington and Oregon topo maps included. Overall, this is a great GPS that has years usefulness and worth the $100 I'm asking for it. Brand new it was near $400. Price is firm, no trades.