Radio Navigationeasy#1151
RNP 4 means the aircraft must remain within:
A
4 km of the desired track
B
4 NM of the desired track for 95% of flight time
CorrectC
4 degrees of the desired track
D
4 NM of the desired track for 99.999% of flight time
Explanation
RNP 4 specifies that the aircraft navigation system must keep the aircraft within 4 NM of the desired track at least 95% of the time.
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