737 MAX Flight Crew Operations Manual
Flight Management, Navigation -
Flight Management System
Operation
MN-FLT-OH-201
11.31.7
Actual Navigation Performance (ANP)
Actual navigation performance (ANP) is the FMC’s estimate of the quality of its
position determination. It is shown on POS SHIFT page 3/3 and on RTE LEGS
pages. ANP represents the estimated maximum position error with 95%
probability. That is, the FMC is 95% certain that the airplane’s actual position lies
within a circle with a radius of the ANP value around the FMC position. The lower
the ANP value, the more confident the FMC is of its position estimate.
March 1, 2021
