Learn how to use the lensatic compass used by the US Military. Plotting a bearing on a map using a round lensatic compass. Sighting the bearing. To determine our location we are going to combine two pieces of information. Use a compass to explore, navigate, map terrain and travel around the Engineers, the engineer compass is also called a lensatic compass.
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Looking at the photo below, let’s say you’re at the north end of Sheeler Lake, where the penciled X is. Though such a simple device has been around for about a thousand years, compasses have not lost their utility. Get your own customized topographical maps, built according to your specifications. You may be tempted to use the MN line on the declination diagram, but be careful.
One of the difficulties inherent to using a compass is that magnetic north is not the same as true north. Perhaps this is why most military personnel are trained to plot bearings using a protractor on a Coordinate Scale lensaic Protractor tool.
Point of Interest An “azimuth” is pretty much the same as a “bearing. Hold a compass level and steady to prevent the needle from touching the sides of the globe or the dial face. Steady the compass by allowing the hand holding the compass to rest in the cupped palm of your other hand. Note the red number on the dial, which is the degrees under the black index line on the compass face.
North is 0 degrees, so a declination of 10 degrees west would mean that you would point at degrees to point at true north. It has replaced radium in recent decades after it was discovered that radium exposure is linked to an increased occurrence of lensagic cancer.
Learn Land Navigation Now. Lensativ can abbreviate to either mils Mag. That way you skip the math, the protractor, the lines, and get it all done quicker.
Using your yo or other straight edge, you draw a line from your current position in the direction of where you want to go. Now, take your map and draw lines at the back azimuth angle you calculated on the map through the features that you’re using as reference points. Point of Interest In addition to degrees to measure directions in a circle, the military also uses 6, mils.
Plotting a bearing on a map using a round lensatic compass
Tilt the sue bracket approximately 30 degrees from the perpendicular position of the compass. Don’t even consider using the hood or tailgate of a lenwatic. Watch this video on YouTube Choosing Landmarks The landmark you choose can be anything visibly noteworthy. It has a half life of about 12 years. With the thumb loop all the way down under the compass, put the thumb of one hand all the way inside compase loop, and place the index finger of that same hand along one side of the compass.
Open the cover completely and pull back the rear sight. The smaller the angle to Magnetic North, the more likely the diagram will show a larger angle. Avoid magnetic fields from magnets, electrical appliances, iron or automobile engines. Unless you are stranded on a deserted islandknowing how to use a compass just may save your life! You don’t want to hold it crooked, cockeyed, or off level.
How to Use a Lensatic Military Compass – Navigate Safely in the Wild
Next, do the same for the second point. Return from Lensatic Compass to Home. That’s the heading that you need to move along to reach your desired end or way fo. This is a low level radioactive isotope that is used in a multitude of applications where self-powered illumination is necessary. That is, take the hod you recorded and subtract ocmpass from it, or mills if using a military lensatic compass.
The cover protects the compass from damage and also contains a wire stretched from top to bottom. Some compasses can be adjusted to include declination, so after adjustment, a reading of 0 degrees would point at true north.
The need to carefully orient the map, and the precautions about metal in the vicinity of the compass makes this type of plotting more difficult than most other methods.
Next, rotate the entire thing map and compass until your compass is telling you that it’s pointing north. A round lensatic compass has no straight edge to align.
The azimuth is the angular measurement of an object’s direction in relation to the viewer. Generally once you have drawn your own Magnetic North line, you will not need to do this again on this map sheet for many years. Rough direction to the cabin. When performed correctly, you will return to the same line you were traveling before you encountered the obstacle. Refer back to this “reality check” occasionally during plotting to make sure what you are doing makes sense.
You want to find your position using the technique of partial resection, so you need to know that tower’s bearing with a high degree of accuracy. Some of the components’ terms are used in the explanations hoe. Those lines will intersect at some point if you’re done your resection properly.
Make sure you include it when you say or write a bearing. The back azimuth is nothing more than the opposite direction of the reading you’re taking. Want a free ebook on Land Navigation?
Turn the compass in a horizontal manner until the azimuth is directly beneath the black index line on the face.