Learn how to use the lensatic compass used by the US Military. PRECISION COMPASS. * LENSATIC *. PROVEN • RUGGED ACCURATE. CAMMENGA. FAX ( ANILINE AVE. HOLLAND, MICHIGAN I get lots of questions via email from people wanting to know how to use a lensatic compass, and I think I’ve covered that pretty well in a series of two posts.
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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.
Lensatic Compass Guide
The azimuth is the angular measurement of an object’s direction in relation to the viewer. 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.
I cannot find the origin of the word “compass” as applied to the magnetic compass. A plumb bob can lesatic suspended so that it cuts Polaris, and the bearing to the plumb bob cord then measured. If you don’t happen to be in Northern Colorado, you can construct a similar example any convenient place near you, and do it as a compass or a map exercise.
To the north of State Route about 2 miles east of Windsor, Colorado there is Antelope Hill, a two-peaked hill about 50 ft. Looking at the photo below, let’s say you’re at the north end of Enginser Lake, where the penciled X is.
It is magnetictrue or grid when referred to magnetic north, geographical north or grid north, respectively.
Declination is extreme and rapidly changing with position in polar areas, making the compass worthless as a navigation aid there.
Use the illustration above to familiarize yourself with the components of a lensatic compass. The point where those lines cross is your location, and the accuracy of that location is only as high as the readings and calculations that you’ve made. A plot of the traverse can then be made, and the enclosed area calculated. Irregular magnetic storms are periods of greatly increased ionization.
From these bearings, the angles A and B can be determined. Line up the sighting groove in the bracket with the wire and an object in the enginwer.
Using a Lensatic Compass
Distances like this can be determined from the map, or from a vehicle odometer, if great precision is not required. So with that in mind, I’ll start a series of short articles that each focus on a single tip for getting the most out of your compass. The compass card may have a sapphire cap and an agate point for its pivot. Locate yourself and a prominent distant object on the map, and measure its magnetic bearing with the compass.
To use your lensatic compass to find the direction of your intended azimuth which you probably got from your map, using your protractor:.
Putting the two in a opaque bag or enclosure is effective as well. In the southern temperate zone, point the 12 in the direction of the sun, and then north is halfway between the 12 and the hour enyineer.
How to Use the Engineer Compass. In the daytime, you’ll normally find something in the distance on your azimuth and walk to it, so you don’t have to keep staring at the compass.
FM does not mention the use of the short line, but it can probably be used to speed up the setting of an azimuth by saving 15 clicks.
Turn your entire body as a unit until your predetermined azimuth falls under the fixed black index line. The Law of Sines gives us the unknown sides: The “lensatic” means that the rear sight is provided with a lens that allows you to read the dial while your eye is close to the rear sight, as it should be.
A diagram always helps to keep the direction of the declination straight. This can be done, for example, before beginning the day’s hike, and the compass will then be useful in conjunction with the map. Take your lensatic compass and open it up all the way so it is one flat line. The sun sends ionizing ultraviolet radiation reaching the earth in about 8 minutes after it is emitted, and streams of particles, mainly protons, that take longer to reach the earth.
This is a low level radioactive isotope that is used in a multitude of applications where self-powered illumination is necessary. In the northern hemisphere, the field points downward to the north, so the south end of the ,ensatic must be weighted.
Things Needed Engineer lensatic compass.
Lensatic Compass gives an introduction to the use of the compass.