Sorry you are having difficulty with the GPS coordinates.
You probably already know some of this, but for Google maps in your web browser, type in the address
http://maps.google.com/. Or, type
http://www.googlemaps.com - both URL addresses get you to the same place. Now, at the top of the Google map page, type in the search field:
n29 21.292, w081 44.068 and click on "Search Maps." That will take you to the entrance of Salt Springs CG in the Ocala NF (FL) on the Google map. Google does convert the coordinates above to a different format, but you can enter the coordinate format as displayed above for the virtual geocache game. By the way, your example GPS coordinate is 16525 Polk St NE, Andover, MN 55304.
As for your magellan sportrak device, please take a look at the "Guidelines" topic and see if that doesn't help you set the format we use in your device. Let us know how things work out . . . Fred