Meet Mr. Swingle: GPS lesson plans:$420
Groundspeak Forum: GPS in education:
USGS Education: GPS, Maps and Compass:
NOVA Online: Lost at Sea... the search for Longitude:
GPS & Place-based Learning:
Dr. Christie's GPS and Geocaching Guide for Educators:
GPS in the Classroom:
Earthcaching Educators Guide:
Earthcache Sites for Teachers: MICHIGAN
Garmin GPS Guides for beginners:
Geocaching Resources:

An Introduction to Geocaching PowerPoint:
PDF of the presentation: