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It is classic mapping compass.
The transparent case allows you to read information directly on the map.
It has a ruler to calculate the distance on a map scale 1:25 000 or 1:50 000,
magnifier. In our case it is not only a magnetic compass, but also a fluid one.
For speed orientations on a compass, they invented an arrow to immerse in a liquid.
Viscous fluid is poured into a hermetically sealed plastic capsule in which the arrow does not rotate.
Due to the fact that the viscosity of the liquid is greater than the viscosity of the gas,
the arrow calms down very quickly - this compass in less than 2 seconds!
The compass itself on the strap with printed lines, on which the capsule
with the limb and the arrow rotates.
Rectangular frame is made of lightweight transparent plastic.