The only instructions (http://copter.ardupilot.com/wiki/planning-a-mission-with-waypoints-and-events/) I have found for "How to prefetch a stored mission map" only shows how to save the map tiles - barely. It doesn't show how prefetching a map for an area goes on, and on loading until you hit escape. And it absolutely does not show you how to actually load the saved map after you have saved it, as the title promises. I found all the folders in \mission planner\gmapcache from clues given in various discussions. How do you load them for use?
Also, can you prefetch multiple areas and name the files so you can load whichever area you are flying, or do you have to go back home and start over for a different area?
I apologize if these questions are answered somewhere, but I can't find any comprehensive tutorial anywhere.