What other kind of map images can Moagu convert to Garmin maps?
Any georeferenced image, or one that can be georeferenced, that can be re-projected to geographic/WGS84 coordinates can be used; the help file describes the process, and offers free solutions that help put your map in the right format. Examples of this kind of imagery include aerial/satellite photography, standard road maps, geology maps, road grids, scanned maps … If you can georeference it, you can make a Moagu map out of it.