Also known as declination. A magnetic compass is very important because it needs no electricity, it needs no calibration. Pilots. But even 5° on a 300 mile trip can cause big problems. As the compass points with local magnetic fields, declination value is needed to obtain true north.. Magnetic Variation: The angular difference between true north and magnetic north. Magnetic declination, sometimes called magnetic variation, is the angle between magnetic north and true north. Magnetic declination changes over time and with location. This means true north is 0.85° west (fun fact: each minute is 0.0166° west, so 51*0.0166=0.85°). Depending on where you are, the angle between true north and magnetic north is different. Find celestial objects in the sky. Note to the fact, the imaginary line joining the magnetic north and magnetic south is inclined at an angle compared to the axis joining the true or geographic north … However, True North can be displayed by simply programming the Variation for your location. The difference between true north and magnetic north is called magnetic declination or magnetic variation. The legend also states that the magnetic north is 1°54′ west (1.9°) for 2011 and is estimated to move east 09′ every year, which means we have 1°18′ (1.3°) difference between true north and magnetic north… The angular difference between true north and magnetic north is known as the declination and is marked in degrees on your map as shown in Figure 6.7. Magnetic north is the direction towards the north magnetic … It's essential to take this phenomenon into account when navigating with a compass. The difference between True North and Magnetic North (declination) varies depending on where in the world you are - it is about 24.5 deg in Cape Town (Magnetic North is West of True North). Magnetic north varies due to shifts in the Earth's core and is at a different location than true north. Magnetic Deviation: A magnetic anomaly that affects the compass. The Kestrel 4500, just like any other compass, will measure Magnetic North. Magnetic North. Erika Jones, curator of Navigation at Royal Museums Greenwich, helped explain this rare occurrence, and the difference between true and magnetic north.. What is happening to compasses at the Royal Observatory? Thenceforth this different north point indication, caused due to the magnetic field of the earth, is known as ‘Magnetic North’. True North is the point where these invisible lines all meet at the northernmost point of the planet. 2. But in locations midwest and eastern US it us 12° to 18° off. 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