My buddy got a Garmin eTrex Legend GPS for Xmas and he promptly gave it to me to learn how to use. He said the book was too thick and he didn't have the time. So the smuck that I am, I said I would try to figure it out. Anyone have this model or one close to it? Is it even worth it to learn? This looks like a hand held model, not one that hooks to a bike. Thanks.