In continuing with their tradition, a number of family members got me REI gift cards for a recent birthday. As my boots, tent, and other such gear is in good shape, it is time to start looking for something new. I've never bothered with a GPS, but there have been times where I would have really liked to have one - especially after crossing my own tracks twice while trying to find my way back to camp. That being said, I know nothing about GPS units. I use one while flying and while commercial fishing, but have never used one that is not airplane or marine specific.
I am well aware that you get what you pay for, therefore I typically buy high-end gear. With the GPS, though, I'm not sure that I need a lot of the functions that are offered. My question is this: What features are absolute must-haves when looking at a new GPS unit? What features are nice, but not necessary, and which features are completely unneccessary? Also, any specific recommendations would be nice. Thanks!