OpenStreetMap
I discovered Open Street Map just as I was shopping online for a GPS. The wiki helped me with choosing one, and now hopefully I'm going to pay something back! I began today with a walk around the very edge of the so-far non-existent Bowburn where I live. Early indications suggest it was a good choice of GPS - the Garmin eTrex Legend HCx had located me before I even left the house! And the error tended to be around 3m most of the time. I'll have a go at turning it all into streets soon.
Discussion
Comment from Andy Allan on 8 August 2008 at 10:05
Definitely a good GPS - make sure you check out adding OSM maps to it for ultimate awesomeness!
Comment from Daytona on 8 August 2008 at 14:29
Welcome and thanks ! I've just completed mapping my area using an eTrex H. I'd ignore the displayed error though - the first thing I did when I got it was to place a marker in the middle of the garden and take readings every day, to check the error, which worked out at about 6m when the unit read 2-3m. Enjoy :-)