Thanks everyone for all the help. After trying it out, I decided to return the GPS unit (and the maps DVD) and brush up on my compass and paper map skills.

@The Eagle
Dude!

@Grasshopper
Thanks! (It's cheaper on Amazon.)

I just bought a Garmin eTrex 30x and I'm considering getting Garmin's TOPO U.S. 24K Southwest maps. But it's $130 - so I want to make sure I'm getting the best maps for my use, which is hiking, both on trails and off. Thanks!