True North Declination Diagram. Print and cut around the outer edge of the sundial diagram. All longitude lines converge to.
Magnetic declination or magnetic variation is the angle on the horizontal plane between magnetic north the direction the north end of a magnetized compass needle points corresponding to the direction of the earths magnetic field lines and true north the direction along a meridian towards the geographic north polethis angle varies depending on position. Some maps especially very old maps do not have this diagram. The geographic north pole is where the northern end of earths axis of rotation is located.
Magnetic declination is the difference between geographic north and magnetic north with respect to your position.
Unfortunately for the wilderness traveler true north is not at the same point on the earth as the magnetic north pole which is where your compass points. Distance xb is 84 2 12 2 12 146 m. Most usgs maps have a symbol of arrows pointing to the geographic north pole shown by a star magnetic north mn and grid north gn. Again turn your body until the magnetic needle aligns with the orienteering arrow and notice the direction of travel arrow is now pointing to true north.