I've got the 310 and it's a pretty good little unit. The batteries last for a long time and it's waterproof. I'm not sure that I'd recommend it for geocaching though. It only displays the coordinates to .01 degree instead of the .001 degree that is usually posted on geocaching.com. I think that the eTrex has a few extra features that are nice to have and is probably worth the extra $20.
> Am looking for a gps unit for geocaching and have found 2 units > available locally. > 1. Magellan gps310 for $99 > 2. Garmin Etrex for $119 > Which one would be better? I dont care about maps or a compass. > > Also is there a difference between the 300 and the 310? They are both > the same price here and the salesman tried to tell me they are the > same unit.