Definition
A fix from bearings of radio transmitters obtained with a direction finding receiver and loop or crossed loop aerial, plotted like visual bearings after applying quadrantal error correction and, over long distances, half convergency. Accuracy is modest, commonly a few degrees, and degrades badly at dawn and dusk through sky wave effects and near coastlines through refraction, so it is treated as an approximate position only. Largely superseded by satellite systems but retained conceptually for homing on distress transmissions and emergency beacons.
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