I'm new to this too, have the exact same problem as the OP and need to ask...PQ? GSAK? PDA? (This one is a Personal Data Assistant?)
Also, I've been told by a Boy Scouting frind...There is a program that you can load the grids to and then send to Magellan. It adds one step but takes out SOOOO much clickin on the actual GPS...
I have only been geocaching for a year and found about 240 with my Magellan Explorist 500. They might not have the best customer support ( almost none at all ) I cant agree with all the magellan bashing I see all I know is when I go for a cache the thing almost always drops me right on the cache.
Sorry back to the question PQ is pocket querry which if you have the paid subscription for geocaching you will allow you creat a custom querry of the caches in a certain area
IE. a 5 mile radius around your home cords you can search a number of caches ( up to 500 ) all tho the Magellan can only import 200 at a time ( Gripe gripe )
GSAK (Geocaching Swiss Army Knife) is a program that alows you to do alot of things like importing that pocket querry into your Magellan and many other things like importing that same pocket querry into a PDA (personal data assistant ) for paperless caching.
well I hope this helped and sorry for being long winded