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Feature

The only 100% RELIABLE NEVER FAIL BACK-UP of the GPS. The only known BACK-UP of the GPS when it malfunctions is your ability to use a military protractor and military compass.
RM Military Protractor is the only protractor with a printed formula and a diagram to align map grid north to match the compass magnetic north
Works in sandstorms, rainstorms, snowstorms, smoke, structures, forest canopies, and thick cloud cover when your GPS fails
No Batteries Required !!