Allow adding additional OCAD/bitmap maps to an event. If the additional maps overlap in any way, you would be able to mark a common point between the maps so that control locations automatically relate between the maps. This would allow:

- Different OCAD maps for 1:10000 and 1:15000 maps of the same area
- Map exchanges that actually use a different map
- Part of a course on a different scale.map of the same area
- Courses that are in different area entirely