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In the Canadian NTS series of maps at latitudes below about 60 the maximum difference between grid north and true north is just over 2 degrees. The grid is a 100,000 meter grid: blocks 100 km x 100 km. The grids are square, but the earth isn't. Square grids simplify the calculations for artillery fire. The calc between grid coordinates and lat/long ...


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Let's address what you refer to as "Grid declination". Unfortunately, there are two competing definitions: First, the definition you are conforming to, is that it is the angle from grid north to magnetic north (see NR Can) -- another name for which is grid-magnetic angle. A different definition is that it is the (generally very small) angle between true ...


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