The following describes my experience generating an OpenLayers slippy map from GPS tracklogs using TileMill, TileCache, and Mapnik. I started by exporting my run data from Garmin Training Center and converting it from Garmin Training Center format (.tcx) to GPS
I followed the instructions to add OpenStreetMap to my run map. Larger version.
Three years of GPS track logs made into a slippy map. This little project was a lot more difficult than I thought it would be. It took a great deal of trial and error. I’ll follow up with a post