Finding North with a lensatic compass

Additional survival tricks

by tonytran2015 (Melbourne, Australia).

#find North, #finding North, #compass, #lensatic, #magnetic, #true North.

A magnetic compass uses the local magnetic field generated by the rotating core of the earth to give the rotational axis of the earth. The two directions are reasonably close.

The magnetic compass is a secondary directional instrument to people who can observe celestial bodies for navigation but is a primary practical directional instrument to people who cannot observe any Celestial body. (Gyro-compasses are too expensive for most people).

1. Basic operation (working with Magnetic and True Norths).

Magnetic Declination

Figure: True North, Magnetic North and Magnetic Deviation.

Obtain the magnetic deviation for your area. This deviation is commonly between (-45) degrees and +45 degrees and it slowly changes to a new value every year. The deviation is obtainable from the internet or by the method given in reference [2]. Positive magnetic declination means the Magnetic North is on…

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