area of probability
- The area around a fix, within which for a stated level of probability, the true position is considered to occur. The 50% probability area of uncertainty around an airplot DR (dead reckoning) position is a circle of radius of 8 NM/h for aircraft up to 250 knots and 20 NM/h if the TAS (true air speed) is above 250 knots.
Aviation dictionary. 2014.
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area of uncertainty — The area around the DR (dead reckoning) position within which, for a stated level of probability, the true position is considered to occur. Normally, the 50% level of probability is taken. The area of uncertainty is drawn as a rectangle centered… … Aviation dictionary