The only known BACK-UP of the GPS when it malfunctions is your ability to use a military protractor and military compass. The 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 SCALES: 1:25,000 / 1:50,000 / !:100,000
RM Products Military Round Protractor – Blue and Black Print
$13.83
This protractor is a math tool used for measuring angles and learning geometry and navigation skills.
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