At first glance, the lensatic compass can seem a bit daunting. Covered in various markings and with multiple moving parts, it looks as though it. Learn how to use the lensatic compass used by the US Military. I have half a dozen navigation apps on my phone, so I rarely get lost! But phones have several major weaknesses: battery life and signal reception. Both of those.
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L ook through the sighting slot and find some target a tree, boulder, whatever that lines up with your sighting wire. Want a free ebook on Land Navigation? Use the illustration above to familiarize yourself with the components of a lensatic compass.
Rather, it is designed for accuracy and ruggedness.
Enroll in my personalized step-by-step video-based online course. Using our compass we have sighted a bearing to our cabin of mils from Magnetic North. The smaller the angle to Magnetic North, the more likely the diagram will show a larger angle. Then, you place your protractor on the map with its center point at your current position, making sure the north-south lines on the protractor line up with the north-south lines on the map.
Instead you will use an imaginary line that runs down the center of the compass. Whenever the luminous magnetic arrow lines up with the luminous short line, you’re following your intended azimuth.
Some of the components’ terms are used in the explanations below. Well, that is, unless you’re doing something silly like holding the compass backwards. Using your protractor or other straight edge, you draw a line from your current position in the direction of where you want to go.
You now have your target’s bearing. North is 0 degrees, so a declination of 10 degrees west would mean that you would point at degrees to point at true compwss. There are several different types of hand held compasses that are designed for specific uses, and a lensatic compass is only one of them.
Note that we are using the magnetic dial in the compass.
For more information on forward and back bearings, see our tutorial on forward and back bearings. Lesatic orienteer a good one, anyway doens’t need to do this very often. Hold the compass with your thumb fully in the thumb ring, and your index finger wrapped around and gripping the circular part of the underneath of the compass’s base.
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Most people assume that lensatic compass is the “proper” term for all hand-held compasses, but that it not the case. We can abbreviate to either mils Mag. Open the cover completely and pull back the rear sight.
Let’s say you see a water tower off in the distance. But not to you, I trust. Welcome To the Lensatic Compass Guide. I get this question more often than you would think.
Plotting a bearing on a map using a round lensatic compass
You may be tempted to use the MN line on the declination diagram, but be careful. We will be plotting our bearing relative to Magnetic North, so there is kensatic need to adjust for a different north reference.
Using a protractor aligned with either True or Grid North depending on what the magnetic declination you are given is referenced tomake a mark on the map at the desired value. A round lensatic compass has no straight edge to align. Some compasses can be adjusted to include declination, so after adjustment, a reading of 0 degrees would point at true north.
When we plot it on the map, we will start plotting at the known location, and extend the bearing line back towards the unknown location. Watch this video on YouTube Another useful method is to orient your map to north by using your compass. It may take a while to get it, and you should practice in a safe location before relying on one, but few devices are pensatic able to help you navigate your way to safety. Making sure you don’t move to change directions, turn the glass compass housing until the short luminous line is directly lined up with the luminous magnetic arrow.
Be sure you understand magnetic declination. When we plot the bearing on our map, our location will be where the line compasa our location and the cabin crosses the shoreline of the lake. Get your own customized topographical maps, built according to your specifications. Put that hand up to the compass, steadying the compass by placing your index finger along the compass’s side, and wrapping your thumb between the bezel ring and the rear sight.
A truck, your radio, or even the barrel of your hunting air gun can push the needle away from north. Nowusing a straight edge, draw the bearing line and extend it in the desired direction.
Make an “L” shape with the index finger and thumb lenssatic your other hand. The cover protects the compass from damage and also contains a wire stretched from top to bottom.