- 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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