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The FMC position is derived from a mathematical combination of the positions determined by the IRS, radio, and GPS systems. It represents the FMC’s estimate of the actual position of the airplane. Its accuracy varies according to the accuracy of the other position determining systems.
YA809, YD651 - YK104 (SB changes YA613 - YA687, YC153 - YC413) Note: If the GPS position update is excessive, GPS updating is suspended until
the GPS position can be determined to be reasonable.
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.
Copyright . The Boeing Company. See title page for details.
11.31.6  June 1, 2005

Flight Management, Navigation -Flight Management System Operation
737 Flight Crew Operations Manual
YA613, YA626, YA721 - YA809

Copyright . The Boeing Company. See title page for details.
March 29, 2004  11.31.7
Flight Management, Navigation -Flight Management System Operation 737 Flight Crew Operations Manual

YA686, YA687, YC153 - YK104

Copyright . The Boeing Company. See title page for details.
11.31.8  March 29, 2004

Flight Management, Navigation -Flight Management System Operation
737 Flight Crew Operations Manual
Vertical Actual Navigation Performance (VANP) YK101 - YK104
Vertical Actual Navigation Performance (VANP) is the FMC’s estimate of the quality of its altitude determination. It is shown on RNP PROGRESS page 4/4. VANP represents the estimated maximum altitude error with 99.7% probability. That is, the FMC is 99.7% certain that the airplane’s actual altitude lies within a vertical band equal to plus or minus the ANP value. The lower the VANP value, the more confident the FMC is of its altitude estimate.
Note: VANP is calculated from the baro-corrected altitude provided by the Air
Data System. The pilot must set the baro setting reported by ATIS or
provided in the approach clearance for the 99.7% confidence level to be
valid.
Required Navigation Performance (RNP)
The FMC supplies a default required navigation performance (RNP) value for oceanic, en route, terminal, and approach environments. RNP can also be supplied by the Navigation Database or may be entered by the crew. Actual navigation performance (ANP) should not exceed RNP.
Environment  Default RNP  Time to Alert 
Oceanic  12.0 NM  80 sec. 
En route  2.0 NM  80 sec. 
Terminal  1.0 NM  60 sec. 
Approach  YA613 - YD655 0.5 NM YK101 - YK104 0.3 NM  10 sec. 

YA721, YA722 If ANP exceeds a Navigation Database or crew entered RNP value, the UNABLE REQD NAV PERF–RNP message will be displayed on the CDU scratchpad after the designated time to alert has elapsed. If ANP exceeds a default RNP value, the IRS NAV ONLY message is displayed in the scratchpad after the designated time to alert has elapsed. The amber FMC lights located on the forward instrument panel will also illuminate with the annunciation of either message. RNP is shown on the POS SHIFT and RTE LEGS pages.
Copyright . The Boeing Company. See title page for details.
Flight Management, Navigation -Flight Management System Operation 737 Flight Crew Operations Manual

YA801 - YA809 (SB changes YA613 - YA687, YC153 - YC413) If ANP exceeds the displayed RNP value, the UNABLE REQD NAV PERF–RNP
message will be displayed on the CDU scratchpad after the designated time to alert has elapsed. When in the approach environment an additional amber UNABLE REQD NAV PERF–RNP will be displayed on the MAP. The amber FMC lights located on the forward instrument panel will also illuminate with the annunciation of this message. RNP is shown on the POS SHIFT and RTE LEGS pages.
YD651 - YK104 (SB changes YA613 - YA687, YC153 - YC413) If ANP exceeds the displayed RNP value, the UNABLE REQD NAV PERF–RNP
message will be displayed on the CDU scratchpad after the designated time to alert has elapsed. When in the approach environment an additional amber UNABLE REQD NAV PERF–RNP will be displayed on the MAP. The amber FMC lights located on the forward instrument panel will also illuminate with the annunciation of this message. RNP is shown on the POS SHIFT, RNP PROGRESS 4/4 and the RTE LEGS pages.
Vertical Required Navigation Performance (VRNP) YK101 - YK104
The FMC uses 400 feet as a default Vertical Required Navigation Performance (VRNP) value for oceanic, en route, and terminal phases of flight.
　
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