";s:4:"text";s:3648:" Surveyors used magnetic north for new surveys through the 19th century. It is located in the Arctic. ATIS/AWOS/ASOS broadcasts, or any information a controller gives you over the radio, is magnetic. This direction is known a True North. True North is the geographic point upon which the Earth rotates. Re: convert coordinates on a property survey to a compass direction "Surveyors usually use true north as a reference, compass, magnetic north, so you have to know local variation." If you hear it, it's magnetic. If you read it, it's true. If so read on... 1. The Geographic North Pole is where lines of longitudes converge into what we call the North Pole. Astronomic or true north is the new bearing reference. True North, Grid North, and Magnetic North all point to slightly different norths. Map users need to understand that there are three different types of north. On the Day Skipper course we will introduce you to the idea that the lines that go vertically up our charts (lines of longitud e), if continued would run directly up to the North Pole. Find your approximate location on a magnetic declination map like this one If you live East of the 0 degree line, True North will be east of the compass needle by the number of degrees shown on the map for your location. As the compass points with local magnetic fields, declination value is needed to obtain true north.. As the compass points with local magnetic fields, declination value is needed to obtain true north.. The magnetic North Pole is a point near the True North Pole but has an extremely high concentration of magnetic rocks. I can't see any methods, properties or services in qml that would calculate true north. Other variables exist. A compass showing magnetic north. Determine if magnetic north points to the east or west of true north in your location. The grid convergence angle is also supplied when grid declination is selected. True North . Grid Declination is defined as the angle of magnetic North relative to grid North where grid North is referenced to the grid lines shown on navigation charts with a Tranverse Mercator projection for a UTM coordinate system. Are there any samples that might show how to get the true north vs magnetic north? Compasses don’t point to this location when they point towards the N on the dial. All charts and textual sources (METAR, TAF, winds aloft, surface analysis charts, etc) use true north as the reference. The only time magnetic north has been used in many years is retracing an old survey based on magnetic north, The magnetic declination from the time of the old survey is used to convert to new bearings. The grid convergence angle is the angle of grid North relative to True North. 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.