When doing this, the lid is opened flat with the compass case. The key to the whole operation is having a map and being able to locate these features on that map. They give the basics of how they comppass, how to shoot an azimuth, how to get a bearing, and so on. This little detail is not mentioned in the field manual.

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How to Calibrate a Magnetic Compass By Anthony Thompson An engineer lensatic compass, also known as a hand compass or sighting compass, allows you to take bearings on physical landmarks which can then be used to determine your exact position on a map or navigate toward the landmark even when it can no longer be seen. This type of compass is also commonly used in the military and for orienteering. Step 1 Lift the front sight of the compass, which also acts as a protective cover, so it is at a degree angle to the base.

Position the rear sight so it leans forward over the compass wheel at an angle of around 45 degrees. Step 2 Raise the compass up to your cheek and look at your chosen landmark through the sights. To improve accuracy, ensure the landmark is in the center of the front sight and fully aligned with the sighting slot above the rear lens.

Step 3 Adjust the position of the rear lens so you can read the bearing on the compass wheel while still maintaining an accurate fix on the landmark. Step 4 Find your position on a map by taking a bearing on a second landmark then aligning the map so the line on it that indicates north faces the same direction as the magnetic north shown on the compass wheel. Draw lines on the map from the landmarks toward the center using the measured angles.

The point where the lines intersect is your current position. The former editor of a monthly computing and technology magazine, his work has appeared in The Guardian, GQ and Time Out. Photo Credits.



Orient the map to the terrain. Sight an azimuth to any visible terrain feature that appears on the map. Place the fully opened lensatic compass on the map with the scale edge running through the terrain feature and with the compass reading the same as the azimuth sighted. Draw a line along the scale edge.


Cammenga Lensatic Compass

When hiking, use a map to help you navigate unfamiliar terrain. Tritium is considered safe for external use because it is a weak beta particle emitter — so weak in fact that the radiation it emits cannot penetrate human skin. Then, from where you are, shoot an azimuth to the feature as accurately as possible, and calculate the back azimuth from that reading. A typical lensatic compass is shown at the right from FM Here, they agree, so there is no deviation and the measurements have been accurately taken. According to United States Army Corps of Engineers, the engineer compass is also called a lensatic compass. A plumb bob can lesatic suspended so that it cuts Polaris, and the bearing to the plumb bob cord then measured.

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