|Equipment Class: Fishing technology||Equipment Type: Wheelhouse|
|Magnetic compass is an instrument containing a freely suspended magnetic element which displays the direction of the horizontal component of the earth's magnetic field at the point of observation.|
Courtesy of Navis.gr
The magnetic compass, as the name implies, relies on the earth's magnetic field and, because the true poles and the magnetic poles on the earth's surface do not coincide, there are various corrections that have to be applied. Magnetic compasses have been developed over hundreds of years and various means have been used to optimize their performance. Magnetic compasses are still retained because of their independence from electrical power. Nevertheless, for magnetic compasses required for emergency purposes there is a continuing need for regular compass adjustment and care in ensuring that metal objects are not placed in the vicinity of the compass, which would be adversely affect it.