My current preference for a smallish GPS is a Foretrex 101. Battery life is acceptable and the AAA batteries interchange with the batts in my lights and other gadgets. It holds a fix well enough in the terrain in which I use it. I haven't tried it in really dense forest cover. It has WAAS capability, which I have never used for real. This unit does not have a map, but I am comfortable transferring UTM coordinates to paper, the way in which I have always used a GPS in the field. Mostly it is light, handy, and heap plenty accurate enough for normal outdoors use.