The simple formula is
1200 X 36m ( distance between two objects)
9X 12 (quantity of the notch)
Of course ,if the distance between two objects is 36m,and and the notches on the glass are 12,and the other object
is some distance from you on the same level ,and the notch is 18. 36/12*18=54m
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WARNING!
In superior quality compass the oscillation of the needle is stabilized by the liquid in which it is totally dipped(13).
Strong variations in temperature or pressure can cause the formation of small air bubbles around the compass
card(13) .These bubbles do not interfere with the compass functioning and they will disappear in 24-48 hours under
normal temperature conditions .
Avoid anyhow to use the compass at temperatures much under 0°centigrade.
Make sure to be always far from magnetic fields created by iron parts ,magnetic cores or electric wires which cause
the compass to show wrong values.
Prevent your instrument from falling or getting damaged and never tamper it (so as to keep your guarantee always
valid)
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