Military Round Protractor

Military Navigation When GPS Fails

The RM Military Round Protractor serves as your primary backup navigation tool when electronic systems fail in the field. This protractor includes printed conversion formulas and alignment diagrams to match map grid north with compass magnetic north, ensuring accurate coordinate readings when GPS is compromised by weather, terrain, or electronic interference.

Key Features

• Grid-to-Magnetic Conversion Formula: Printed formula and diagram eliminate coordinate errors caused by magnetic declination
• Multi-Scale Compatibility: Works with 1:25,000, 1:50,000, and 1:100,000 scale military maps
• Round Design: Allows 360-degree bearing measurements and triangulation plotting
• Field-Proven Backup: Functions in conditions where GPS fails including storms, dense canopy, and electronic interference

Specifications

Frequently Asked Questions

Why do I need the conversion formula printed on the protractor?

Without magnetic declination correction, your grid coordinates will be off by several degrees. The printed formula lets you align map grid north with your compass magnetic north for accurate positioning.

What map scales does this protractor work with?

This protractor is calibrated for 1:25,000, 1:50,000, and 1:100,000 scale maps, covering the most common military topographic map formats.

When would I use this instead of GPS?

GPS fails in sandstorms, heavy weather, dense forest canopy, inside structures, and during electronic interference. This protractor works in all those conditions when paired with a compass and map.

How do I use the grid-to-magnetic conversion feature?

The printed diagram shows you how to align the protractor with your map grid lines, then apply the magnetic declination correction using your compass bearing.