RNP – Required Navigation Performance.
– Specified navigation accuracy for a route or
departure/approach procedure in NM units
– Enroute RNPs usually 2.0 or greater
– Approach RNPs can be as low as 0.11
• ANP – Actual Navigation Performance
– The FMC calculated certainty of the airplane’s
position in NM units
– There is a 95% probability that the airplane is
within the displayed ANP
ANP does not relate to course tracking accuracy!
• When ANP exceeds RNP the airplane position accuracy is
in question
• Smaller RNPs require more accurate FMC updating sources
(DME-DME, GPS, etc)
• When ANP exceeds RNP, the airplane’s actual navigation
position does not meet the required accuracy and a crew
alert is provided
– Specified navigation accuracy for a route or
departure/approach procedure in NM units
– Enroute RNPs usually 2.0 or greater
– Approach RNPs can be as low as 0.11
• ANP – Actual Navigation Performance
– The FMC calculated certainty of the airplane’s
position in NM units
– There is a 95% probability that the airplane is
within the displayed ANP
ANP does not relate to course tracking accuracy!
• When ANP exceeds RNP the airplane position accuracy is
in question
• Smaller RNPs require more accurate FMC updating sources
(DME-DME, GPS, etc)
• When ANP exceeds RNP, the airplane’s actual navigation
position does not meet the required accuracy and a crew
alert is provided
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