My name is Will Pittenger. I have been making KMZ sets for Google Earth for a long time. After I starting making those, I wanted overlays for my sets. I was unsatisfied with the accuracy of the images available at Wikimedia Commons. So I started making my own with Inkscape and uploading them. Then I needed a place for anyone that liked my KMZ sets and/or maps to find others. For a while, a simple blog sufficed. But, once I started getting requests, I knew I needed something better. This site is the result. You are welcome to set up an account. Some activities are for registered users only. Take your time poking around and let me know what you think.
In addition to the main track, I found a karting track. The main track has an overlay based on a brand new SVG. Both tracks have polygons for the track itself and paths for pit road. I also added placemarks for each turn.
Wikipedia says there is a Motorcross track, but I didn't see it. Might be too new to show up. There is also supposed to be Autocross track, but Wikipedia says those are normally set up in parking lots with traffic cones. They emphasis safety rather than who gets there first. So the track would be invisible and might change every time in dramatic fashion. Sorry.