This one time, at band camp, Barry Hunter wrote:
Or is there a way to get a list of currently running OpenGuides, and their (approx) area of coverage?
Well the list is probably small enough now that you could visit each and work it out.
Most are city-based, though mine (engineer.openguides.org) is global.
At the moment there are no mechanisms for Openguides to talk to each other, but it would be a Good Thing <tm>.