Navigate using most accurate information available (continue to
monitor FMC position using VOR/ADF raw data displays on
non–flying pilot's navigation display).

CAUTION: Navigating in LNAV mode with an unreliable FMC position may result in significant navigation errors.
Navigate by conventional VOR/ADF procedures, radar vectors from
ATC, dead reckoning from last known position, and/or use of visual
references.

Inhibiting VOR/DME Use for Position Updating
Note: This procedure inhibits the use of VOR/DME information for FMC position updating. Use DEL key to remove a VOR/DME from inhibit status.
PROG page .................................................................................... Select Observe NAV STATUS prompt displayed.
NAV STATUS page ........................................................................ Select

NAV OPTIONS page ................................... Select (NEXT/PREV page) Observe dash prompts for VOR/DME INHIBIT. Enter desired VOR/DME identifier (a previous entry may be overwritten but will no longer be inhibited).
Copyright . The Boeing Company. See title page for details.

Supplementary Procedures -Flight Management, Navigation 737 Flight Crew Operations Manual
Inhibiting GPS Updating
Note: GPS position updates are allowed for all United States National Airspace approach operations. Outside this region, GPS position updates are allowed during approaches only if the FMC database and approach charts are referenced to the WGS-84 reference datum. GPS updates should be inhibited for all other approach operations.
PROG page ..................................................................................... Select Observe NAV STATUS prompt displayed.
NAV STATUS page ........................................................................Select

NAV OPTIONS page ....................................Select (NEXT/PREV page)

GPS UPDATE .................................................................................. OFF

Vertical Navigation (VNAV)
Temporary Level Off during Climb or Descent (Not at FMC Cruise Altitude)
MCP altitude selector ................................................ Set desired altitude YD651 - YD655 Observe VNAV ALT on flight mode annunciator as level off is initiated. MCP N1 light will extinguish if leveling from a climb. N1 Limit changes to CRZ if leveling from a climb. To continue climb/descent: MCP altitude selector ........................................... Set desired altitude YD651 - YD655 ALT INTV switch........................................................................Push Observe climb or descent initiated. Mode annunciations appear as initial climb or descent.
Copyright . The Boeing Company. See title page for details.
Supplementary Procedures -Flight Management, Navigation

737 Flight Crew Operations Manual
Intervention of FMC Altitude Constraints during VNAV Climb YD651 - YD655
MCP altitude selector ..................................................... Set new altitude New altitude must be higher than the FMC altitude constraint(s) to be deleted.
ALT INTV switch ............................................................................ Push Each push of the ALT INTV switch will delete an FMC altitude constraint.
Intervention of FMC Cruise Altitude during VNAV Cruise YD651 - YD655
MCP altitude selector .......................................................................... Set

ALT INTV switch ............................................................................ Push If a higher altitude is selected, a CRZ climb will be initiated. If a lower altitude is selected, an early descent will be initiated.
Intervention of FMC Altitude Constraints during VNAV Descent YD651 - YD655
MCP altitude selector ..................................................... Set new altitude New altitude must be lower than the FMC altitude constant (s) to be deleted.
ALT INTV switch ............................................................................ Push

Each push of the ALT INTV switch will delete an FMC altitude constraint. If all FMC altitude constraints are deleted, the descent mode will
revert to a VNAV speed descent.
Intervention of FMC Airspeed Constraints during VNAV YD651 - YD655
SPD INTV switch ............................................................................ Push MCP IAS/MACH display shows current FMC target speed.
MCP speed selector ...................................................... Set desired speed VNAV remains engaged.
Copyright . The Boeing Company. See title page for details.

Supplementary Procedures -Flight Management, Navigation 737 Flight Crew Operations Manual
To resume former FMC speed: SPD INTV switch........................................................................Push MCP IAS/MACH display blanks and FMC commanded VNAV speed is active.
　
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