i have an e-trex too. its pretty cool. used it mostly for geocaching. i think it was like 100 bucks, and that was like 4 or 5 years ago. they probably have a new model out now though. its pretty portable. about the size of an old nokia cell phone. it does not have maps or anything, but you can track your location and stuff. it does have a nice feature for hiking, you can set it to mark the path youve been taking. basically, it marks a waypoint like every 20 feet, so if you go into the woods and get lost, you can follow your path back out. it doesnt have a lot of crazy features or anything, but for basic stuff, waypoints, compass etc, it does the trick.