Position Initialization (POS INIT)
Push – displays the POS INIT page.
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Flight Management, Navigation -FMC Preflight 737 Flight Crew Operations Manual
Position Initialization Page 1/3
The position initialization page 1/3 allows airplane present position entry for IRS alignment and FMC initialization. The same page is used to enter/update the magnetic heading for an IRS which is in the ATT mode. There are three POS pages.

Reference Airport (REF AIRPORT)
The reference airport entry allows entry of the current airport for display of the
airport latitude/longitude.
Optional entry.

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Flight Management, Navigation -FMC Preflight 737 Flight Crew Operations Manual

Valid entries are ICAO four letter airport identifiers.
Displays the latitude and longitude of the reference airport.
Removes previous GATE entry.
Entry blanks at lift–off.

GATE
The gate entry allows further refinement of the latitude/longitude position.
Optional entry after the reference airport is entered.
Valid entry is a gate number at the reference airport.
Displays the latitude and longitude of the reference airport gate from the

navigation database.
Changes to dashes when a new reference airport is entered.
Entry blanks at lift–off.

GMT – Month/Day (GMT – MON/DY)
Displays GPS time and date. If the GPS time is not valid, GMT starts at 0000.0Z when the FMC is first powered. MON/DY is blank. Manually enter the correct GMT.

INDEX
Push – displays the INIT/REF INDEX page.

Last Position (LAST POS)
Displays the last FMC computed position.

Set IRS Position (SET IRS POS)
The set inertial position entry is required to initialize the IRS. Select the most
accurate latitude/longitude for the initialization. A displayed latitude/longitude
can be selected or a manual entry can be used.

If an entry is not made before the IRS finishes the initial alignment, the scratchpad
message ENTER IRS POS is displayed.

Failure of the manually entered position to pass the IRS internal check displays
the scratchpad message ENTER IRS POS.
Enter airplane position latitude and longitude.

Box prompts are displayed when either IRS is in the ALIGN mode and IRS
present position has not been entered.

Blanks when the IRS transitions from the alignment to the navigation mode.

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Flight Management, Navigation -FMC Preflight 737 Flight Crew Operations Manual

Set IRS Heading (SET IRS HDG)
Enter/update magnetic heading for any IRS which is in ATT mode. Line blanks when IRS not in ATT mode.

ROUTE
Push – displays the ROUTE page.
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Flight Management, Navigation -FMC Preflight 737 Flight Crew Operations Manual

Position Reference Page 2/3
Position reference page 2 displays the airplane positions as calculated by the FMC, IRS, GPS, and radio navigation receivers.
This page displays latitude/longitude. All position displays are in actual latitude and longitude, as calculated by the respective system. Ground speed is displayed for the FMC and each IRS.

FMC Position (FMC POS)
Displays the FMC calculated latitude/longitude.
Blank if FMC position is invalid.

IRS L
Displays the latitude/longitude position as determined by the left IRS.
Blank if IRS position is invalid.

IRS R
Displays the latitude/longitude position as determined by the right IRS.
Blank if IRS position is invalid.

RADIO
Displays the latitude/longitude position as determined by the navigation radios.
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Flight Management, Navigation -FMC Preflight 737 Flight Crew Operations Manual
Blank if on the ground or if radio position is invalid in flight.

Groundspeed (GS)
Displays the ground speed for FMC and IRS.
Blank if ground speed of related system is invalid.

GPS L
Displays the latitude/longitude position as determined by the left GPS.
Blank if GPS position is invalid.

GPS R
Displays the latitude/longitude position as determined by the right GPS.
Blank if GPS position is invalid.

Copyright . The Boeing Company. See title page for details.
FMC Preflight

Route Page 1/X
The route is entered and displayed in air traffic control format.
　
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