This compass is a map reader, which means that it is a compass connected with a magnifying glass - a replica of the British device from 1905. Place the compass on an even surface, for example on a map lying on a table. It has a safety system that immobilizes the needle. After releasing this lock with a screw, the compass starts working. After a while of work, the amplitude of deflection of the needle will decrease until the direction is finally stabilized. Arrange the compass so that the red arrow lines up with the north. After stabilization, the needle may slightly tremble.
Map readers are accurate compasses, they are used to precisely determine the azimuth of a journey or route. On the inside of the compass you can see the exact angular scale in the range of 0 - 360 degrees. enabling the determination of the azimuth, i.e. the angle between the North and the desired place selected on the map. Apart from finishing the work, the needle should be blocked.
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