Reference Navigation Data
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.
VOR/DME NAV - switches VOR/DME NAV updating between OFF and ON.
Push - when ON is displayed in large font:inhibits the FMC from using VOR/DME data for position updates
changes OFF to large font
displays ALL in both locations of the VOR ONLY INHIBIT line
Push - when OFF is displayed in large font:
enables VOR/DME updating
changes ON to large font
deletes the ALL from the VOR ONLY INHIBIT line
Push - when ON is displayed in large font:
Push - when OFF is displayed in large font: