Lensatic Compass Picture Instructions

A lensatic compass works as any other compass with a couple of added features. The lensatic compass has a feature that allows angles and declination to be transferred to the map in use. This is traditionally done with a protractor and a writing tool, but with the lensatic compass, you have a way of obtaining this calculation without having to do the math. Once this angle is determined, work the compass as you would any other compass and take compass bearings to navigate and find your way.

Things You'll Need

  • Topo map
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Instructions

    • 1

      Spread your map on a flat surface, and open the lensatic compass all the way, making the two cylinders line up next to each other with the declination line and mirror going flat and elongated.

    • 2

      Place the length of the compass down on the map, and line up the declination line (the line going straight through the mirror) to the north-south axis line of the map. Line it up parallel.

    • 3

      Spin the map and compass as one solid unit, getting the compass to the point it is reading north.

    • 4

      Set the lensatic compass stopper (the small lever on the base of the front cylinder) to lock the declination and work the compass for the adjusted angle. The lensatic compass now is ready for navigation as the calculations are bypassed, and the compass is set for the magnetic declination (the natural deterioration and variance of the magnetic north readings on the Earth's pull).