The lensatic compass or also known as a military compass or walking compass is used to mark courses to distant points and follow the direction with the least possible margin of error.
Lensatic or walking compasses are very precise and robust models although there are always margins of error which will vary depending on the form of measurement: facial or ventral. It may vary between 3 and 10 degrees.
It is made up of different parts that make it special from the rest of compasses:
- Floating blade with magnetized needle: A lensatic compass has the magnetized needle built into the floating blade. The limb of these compasses is divided into sexagesimal degrees and milesimal or thousandth gunners degrees.
- Moving crown gear: It is the independent moving circumference of the limbus. Contains a light mark for measurements. It has 120 teeth or notches. If we divide 360º between these 120 notches, it tells us that each notch is equal to 3º, each click of the crown is 3º.
- Fixed light mark: Mark that determines our course measured in limbo.
- Wire and Rear Sight: These two parts work together to achieve the most accurate aiming at the target.
- Lens or magnifying glass: It facilitates the reading of the degrees of our course in limbo.
- Luminous marks: They are used to use the compass in low visibility conditions.
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