0 the direction towards the top of the earth along an imaginary line at an angle of 90° to the equator:
The angle between the magnetic north and the true north (geographic north) at any time is the 'variation'.
That is certainly true north of the border.
The same diagram may show the angle of grid north (the direction of the map's north-south grid lines), which may differ from true north.
The labyrinth is oriented in the direction of true north, as indicated by the directional lines created with the granite blocks.
Maps intended for usage in orienteering by compass will clearly indicate the local declination for easy correction to true north.
It is used to determine the orientation of true north by locating the meridian direction.
The intersection of the meridian plane with the horizontal contains the true north-south geographic reference bearing required.
The phase difference corresponds to the actual bearing relative to magnetic north (in some cases true north) that the receiver is from the station.
