Kingsley-Hughes K. Hacking GPS

Wiley, 2005. — 351 p.
Your GPS is a really cool toy, but what if you could make it even cooler? What if you could build and hook up data cables, modify your iPAQ cradle to take a GPS connection, tweak the firmware, hook up to your PC without expensive software, use GPS data in a hundred creative ways, even solar-power your GPS? Suppose you could beef up your "first to find" quotient when geocaching, or use your GPS as a super-accurate clock. Well, you can. Read on—your adventure is just beginning!
Here's how to soup up your GPS
Covers both Garmin and Magellan models
Crack the secret codes
Build auxiliary battery packs
Navigate with your GPS
Make power and data cables
Sharpen your signal
Keep firmware update
Hack out a PC connectio
Create and load dat
Grab screenshots on the move
Set up an atomic clock
Customize GPS games
Discover paper-free geocaching