Geologging

Geologging is the the practice of recording your position via GPS, so that a log can be displayed of your travels. I like geolog so that I can geotag my photos and draw a map of where I've been. I find it really cool to be able to look at a map of where I've been.

Hardware

I log my position with a dedicated GPS logger. You may be able to log with a car GPS device, but the big, bright screen will only get you an hour or so of logging. You may be able to do it with an iPhone or a Palm Pre, but phone GPS' are weak and it will also kill your phone's battery. A good GPS logger costs ~$100 and runs for ~10 hours on a single set of batteries.