The Garmin GPS 60 is non maping,Garmin GPSMAP 60 is mapping.
I'm also new to this sport saving up for my frist GPS,i'm leaning toward the Garmin GPSMAP 60 as my frist unit,I want a mapping one,one that uses USB to load waypoints,it has a long battery life 28 hours.
http://www.garmin.com/manuals/gpsmap60_ownersmanual.pdf you'll need Adobe Reader to open up the pdf,this is the owners manual.
I hope to have one latter this summer.
"geocaching navigation mode",If I remember right it is used to store your geo caches and manage them,as you find them you can mark found.
The ceapest i've seen sofar is http://www.digtallyunique.com/010-00322-10.html#
Hope theses links work for me i'm still new useing this forum.