If you've arrived here and don't know what UIM is, you should first go read the story of the UIM at 2012-2112.com. Once you've been there, you'll then know what UIM stands for, so what follows will make much more sense to you.
Mouse-over graphics below to see sector delineations.
Mosaic Production System (MPS) World Projection
Four Sectors Around 0° Latitude (Equator) and 180° Longitude (Antimeridian)