Once you've got the GPS bug, you'll find there's a lot more than simply knowing where you are and where you're going. There's also knowing where you've been, so you can plot your bike rides in Google Earth , geolocate your trail photos after the fact, or otherwise track your movements. This requires what's known as a GPS "logger," which is either a feature in some of the higher-end handheld GPS navigation gadgets, or a stand-alone device. I’ve used two of the stand-alone variety on robotic aerial photography planes , which is admittedly a little extreme, but the conclusions are useful for anyone just going for a walk in the park. [...]
da: http://www.kk.org/cooltools/archives/002547.php
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