North is geographically defined as a zero degree bearing. In geography there are three types of north
True north
This is the position of the geographical north pole. all longitudes meets at true north. It is usually represented by a star on the sign of the topographical map
Magnetic north
This is the direction to the magnetic north pole, as shown by the north-seeking needle of a compass.
When a needle of a compass is left to swing freely, it comes to rest in a north-south position.
Its north point shows the earth’s magnetic north. This type of north varies from place to place and from time to time.
It is usually represented by a line ending with half of the arrowhead
Grid north
On most topographical maps, there are lines that are drawn north to south. These lines are called grid lines (eastings). they meet at point in the north pole called grid north. It is symbolized by the latter GN.
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