VisorCentral.com (http://discussion.visorcentral.com/vcforum/index.php)
- Springboard Modules (http://discussion.visorcentral.com/vcforum/forumdisplay.php?forumid=10)
-- plug in from precision navigation (http://discussion.visorcentral.com/vcforum/showthread.php?threadid=5198)

anybody heard anything about a module, not neccesarily a springboard, from precision navigation?
http://www.precisionnavigation.com/

they make an add on magnetic compass for palm products, and i can't see how it'd be much of a project for them. think of it, compass plugged into the bottom and a GPS reciver plugged into the springboard port. your visor becomes the ultimate handheld navigation instrument.