Theory and protocols
GPS tutorial
Intro to Garmin GPS  
User Manual  (cached)
Advanced User Manual 
Spec
IO Spec (cached)
text output spec
FAQ
Undocumented features 
Firmware Archive
Latest  firmware at Garmin

etrex modifications

Mountain Bike Version
Introduction
What's in it for mountain bikers
How to create the release
Advanced Topics
Credits

Firmware Disassembly Effort

Mountain Bike Navigation 'cockpit'
Introduction
The parts
Construction

Bringing a drowned etrex back from the dead

Personalize etrex screen text

Hiking Version
Land Release 1.2
Land Release 1.1

Making your own cable
getting a plug
Assembing the plug
Assembing the cable
External power supply for the etrex

Turn the etrex into a Summit (well, almost)
Introduction
Usage
Limitations
Download

Bike light power for the etrex
Introduction
Procedure

Israeli etrex (Hebrew)

Links page

Turbo2Ozi

Other Sites
First Waypoint
etrex currently under $90 for sale now on ebay

The improved etrex (firmware 3.0) now on ebay