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back azimuth

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  1. [cartography] The direction line drawn on a map from the known position of a distant feature back to your position; a line from your current position backward along your route; the opposite direction from a given azimuth calculated by adding 180 degrees to azimuths less than 180 degrees, or subtracting 180 degrees from azimuths greater than 180 degrees. Also called a backsight and direction line.

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