Reference Navigation Data

Performance Initialisation Route Climbs Cruise Descent Direct Intercept Legs Departures and Arrivals Hold Progress Fix

The Reference Navigation Data page displays data about waypoints, navaids, airports and runways. Use this page to inhibit FMC position updates from radio navaids.

(SB changes with VOR ONLY INHIBIT line displayed on the REF NAV DATA page.)

IDENT - Valid entries are any waypoint, navaid, airport, or runway from the navigation database. Only runways at the destination airport can be entered. Entry changes to dashes when page is exited and then reselected.
LATITUDE - Displays latitude of entered identifier. When the identifier is a runway the latitude displayed is for the threshold of the runway.
MAG VAR - displays magnetic variation when entered identifier is a navaid. LENGTH - displays runway length when entered identifier is a runway.
NAVAID INHIBIT - When a navigation radio is known to provide erroneous position information, the FMC must be inhibited from automatically tuning that navaid. Enter the identifier of up to two VOR, VOR/DME, VORTAC, or DME stations that must not be used for FMC position updates. Entries are blanked at flight completion. Deleting or overwriting removes a previous inhibit.
VOR ONLY INHIBIT - Use this line when only the VOR portion of a VOR/DME or VORTAC navaid must be inhibited. ALL is displayed if VOR/DME NAV is inhibited. Enter the identifier of up to two VORs that should not be used for FMC position updates. Only the VOR portion of the navaid is inhibited, the FMC will still tune the DME for DME-DME updating. Entries are blanked at flight completion. Deleting or overwriting removes a previous inhibit.
INDEX - Displays the INIT/REF INDEX page.
FREQ - Displays frequency of entered identifier when it is a navaid.
LONGITUDE - Displays longitude of entered identifier. When the identifier is a runway the longitude displayed is for the threshold of the runway.
ELEVATION - Displays elevation of entered identifier when it is a navaid, airport, or runway.
NAVAID INHIBIT - When a navigation radio is known to provide erroneous position information, the FMC must be inhibited from automatically tuning that navaid. Enter the identifier of up to two VOR, VOR/DME, VORTAC, or DME stations that must not be used for FMC position updates. Entries are blanked at flight completion. Deleting or overwriting removes a previous inhibit.
VOR ONLY INHIBIT - Use this line when only the VOR portion of a VOR/DME or VORTAC navaid must be inhibited. ALL is displayed if VOR/DME NAV is inhibited. Enter the identifier of up to two VORs that should not be used for FMC position updates. Only the VOR portion of the navaid is inhibited, the FMC will still tune the DME for DME-DME updating. Entries are blanked at flight completion. Deleting or overwriting removes a previous inhibit.
INHIBIT - Alternately switches VOR/DME NAV updating between INHIBIT and ENABLE.
Push - when the prompt reads INHIBIT
  • inhibits the FMC from using VOR/13ME data for position updates
  • changes the prompt to ENABLE
  • displays ALL in both locations of the VOR ONLY INHIBIT line.

    • Push - when the prompt reads ENABLE
  • enables VOR/DME updating
  • changes the prompt to INHIBIT
  • deletes the ALL from the VOR ONLY INHIBIT line

    • Pegasus | 11.42.38 | SB Change>