Talk about a flash back, I remember this being talked about at Defcon 14 by RenderMan.

Google for those who do not have it already: "Defcon14-V7-Renderman_and_Thorn-Church_of_Wifi.mp4"

The Digle Readme file has detailed instructions about where to exactly place items.
http://wigle.net/jigle/readme.txt and the downloads page in the Digle area states drop in Jigle directory which in this case would apply to where to drop jigle mappacks as well.

On the main page its labeled "Add a wireless network to WiGLE [from a stumble file] or [by hand]" and at the top of almost every page on wigle net "Post File"

http://wigle.net/gps/gps/main/postfile/