The inner numbers represent the "MILS" measurement, which is a scale used by the military.
The outer numbers correspond to degrees.
Details: BRAND NEW, BEAUTIFUL reproduction of a BRUNTON Compass. Essential item for hiking, camping, and other outdoor navigation activities! Makes an IMPRESSIVE (your home or work desk) decor display!! Comes with a BEAUTIFUL hard wood cherry box!! STUNNING antique look!!! Makes a great (all season) Gift !!! This wonderful item is mainly used for decorative/collection purposes. ****