Magnetic declination. Tourist tips

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Magnetic declination. Tourist tips

Tourist tips

The magnetic meridian in most cases does not coincide with the true (geographic) one and forms an angle called magnetic declination for this place.

On navigational charts, magnetic declination is referred to as declination, so as not to be confused with the other, astro-navigational meaning of the term "declination".

Magnetic declination varies in space and time. The declination value is measured in degrees west or east, depending on which point - west or east of true north - the magnetic needle points.

Two lines of zero declination, called agonic lines, divide the entire earth's surface into two regions. One of them contains the Atlantic and Indian oceans. Africa and Western Europe. In another area are the Pacific Ocean, almost all of Asia and a significant part of North and South America. In Moscow, the eastern declination is about 7°.

In those places where the magnetic lines enter vertically into the ground, the horizontal component of the field is small, there is not enough strength to turn the compass needle, therefore, in the regions of the magnetic poles. The compass readings are highly susceptible to external influences. Strong magnetic storms are observed in the regions of the magnetic poles.

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