![]() ![]() Say you take a bearing on your compass in an area with West declination.Find out the declination in the area in which you'll be traveling so you can compensate for it. East of that line, declination orients toward the West, meaning that Magnetic North is several degrees West of True North. In the US, the line of zero declination runs up through Alabama, Illinois, and Wisconsin, X Research source at a slight diagonal.To make using the compass much easier, you can correct for declination by either adding or subtracting the declination amount from your bearing in degrees, depending on whether you're taking a bearing from a map or from your compass, and whether or not you're in an area with East declination or West declination. Declination refers to the amount by which North on your map and North on your compass differ at any given point, given the Earth's magnetic field. It's important to compensate by taking the declination into account. Think of how off you'll be after ten or twenty miles. While the difference may seem incidental, traveling just one degree off for the distance of a mile will have you about 100 feet (30.5 m) off track.Depending where you are on the surface of the Earth, you'll have to account for the Magnetic shift to get an accurate reading. ![]()
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