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Thumb loop
This keeps the face of the compass closed, but it’s also used – as you might have guessed – to loop your thumb through during operation. Since you’ll be holding your lensatic compass upright and straight in front of you, you need the thumb loop to help hold her steady.
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Sighting Slot
The sighting slot houses the lens in many lensatic compass models.
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Lens
This is what you see the compass through. The lens appears just above the thumb loop and aligns with the sighting wire. The lens will magnify your bezel point on the compass itself, allowing you to right your aim.
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Magnetic Arrow
Also referred to as the magnetic needle, this piece is the most important part of any compass. This gives you direction.
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Sighting Wire
This comes in handy right out of the box. Your sighting wire helps you calibrate your lensatic compass, but it’s also used to sight in on an object or landmark when you’re trying to navigate your way through the land. More on this later.