Has anyone been to the Monkey Butt web site ?? If you have I'm sure that like me your were very disappointed to find a distinct lack of butts of any kind, instead there are maps and an android/IOS app.
You can set up a map or a location to advertise a ride out or meet up, this can be either done as a set of pin pushes or from GPX data.
These are then available to the world, a specified group or by invitation so naughty bikes can be in or not.
The mapping used is from open maps and is probably as accurate as google etc with the little extra that you have contour lines and shading.
Might useful ??
www.monkeybutt.bike