Marked with degrees and mils measurements around the circumference of the protractor. Includes a 1:24,000 scale for 7.5 minute topographic maps. Fits for UTM, MGRS, USNG or other metric based coordinate systems. Used with the following map scales: 1:24,000 1:25,000 1:50,000 1:10,000 1:100,000 1:250,000 1:500,000. Larger 1:50,000 and 1:100,000 scale rulers for maps with grid spacing.