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NCO Board Map Reading and Land Navigation, TC 3-25.26 & FM 3-25.26 Part 6

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This deck covers key concepts and techniques from the NCO Board Map Reading and Land Navigation guide, focusing on the Lensatic Compass and field expedient methods.

Para 9-2 | What are the three major parts of the Lensatic Compass?

1. Cover 2. Base 3. Lens

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Key Terms

Term
Definition

Para 9-2 | What are the three major parts of the Lensatic Compass?

1. Cover 2. Base 3. Lens

Para 9-2 | Describe the Purpose of the Cover of the Lensatic Compass?

The compass cover protects the floating dial. It contains the sighting wire (front sight) and two luminous sighting slots or dots used for night na...

Para 9-2 | What does the Base of the Lensatic Compass Contain?
(1) The floating dial is mounted on a pivot so it can rotate freely when the compass is held level. Printed on the dial in luminous figures are an arr...
Para 9-2 | What does the Lens of the Lensatic Compass Contain?
The lens is used to read the dial, and it contains the rear-sight slot used in conjunction with the front for sighting on objects. The rear sight also...
Para 9-4 | What two techniques for using the Lensatic Compass?
1. the Centerhold Technique 2. the Compass-to-Cheek Technique
Para 9-4 | How do you use the Centerhold Technique?
First, open the compass to its fullest so that the cover forms a straightedge with the base. Move the lens (rear sight) to the rearmost position, allo...

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TermDefinition

Para 9-2 | What are the three major parts of the Lensatic Compass?

1. Cover 2. Base 3. Lens

Para 9-2 | Describe the Purpose of the Cover of the Lensatic Compass?

The compass cover protects the floating dial. It contains the sighting wire (front sight) and two luminous sighting slots or dots used for night navigation.

Para 9-2 | What does the Base of the Lensatic Compass Contain?
(1) The floating dial is mounted on a pivot so it can rotate freely when the compass is held level. Printed on the dial in luminous figures are an arrow and the letters E and W. The arrow always points to magnetic north and the letters fall at east (E) 90° and west (W) 270° on the dial. There are two scales; the outer scale denotes mils and the inner scale (normally in red) denotes degrees. (2) Encasing the floating dial is a glass containing a fixed black index line. (3) The bezel ring is a ratchet device that clicks when turned. It contains 120 clicks when rotated fully; each click is equal to 3°. A short luminous line that is used in conjunction with the north-seeking arrow during navigation is contained in the glass face of the bezel ring. (4) The thumb loop is attached to the base of the compass
Para 9-2 | What does the Lens of the Lensatic Compass Contain?
The lens is used to read the dial, and it contains the rear-sight slot used in conjunction with the front for sighting on objects. The rear sight also serves as a lock and clamps the dial when closed for its protection. The rear sight must be opened more than 45° to allow the dial to float freely.
Para 9-4 | What two techniques for using the Lensatic Compass?
1. the Centerhold Technique 2. the Compass-to-Cheek Technique
Para 9-4 | How do you use the Centerhold Technique?
First, open the compass to its fullest so that the cover forms a straightedge with the base. Move the lens (rear sight) to the rearmost position, allowing the dial to float freely. Next, place your thumb through the thumb loop, form a steady base with your third and fourth fingers, and extend your index finger along; the side of the compass. Place the thumb of the other hand between the lens (rear sight) and the bezel ring; extend the index finger along the remaining; side of the compass, and the remaining fingers around the fingers of the other hand. Pull your elbows firmly into your sides; this will place the compass between your chin and your belt
Para 9-4 | What are the Advantages of using the Centerhold Technique?
(1) It is faster and easier to use. (2) It can be used under all conditions of visibility. (3) It can be used when navigating over any type of terrain. (4) It can be used without putting down the rifle; however, the rifle must be slung well back over either shoulder. (5) It can be used without removing eyeglasses
Para 9-4 | How do you use the Compass-to-Cheek Technique?
Fold the cover of the compass containing the sighting wire to a vertical position; then fold the rear sight slightly forward. Look through the rear-sight slot and align the frontsight hairline with the desired object in the distance. Then glance down at the dial through the eye lens to read the azimuth
Para 9-4 | When is the Compass-to-Cheek Technique normally used?
For Sighting
Para 9-5 | When are the Field Expedient Methods to determine the four Cardinal Directions?
1. Shadow-Tip Method 2. Watch Method 3. Star Method