It is a grid based map that contains all of your allies on each section of the map. New sections are opened every time you complete a map, and every time you create a character they take up one of the sections on the map. The Cam-Pain map covers all the main maps save for 10-7, as well as the Mount of Ordeals. After all sections have been unlocked, the remaining water sections will become brighter, but this is merely a cosmetic effect.