(with or without leading zeros) and “a” is an optional character L, R, or C.
In order to access runway data, an airport must be identified.

Airport Identifier (AIRPORT IDENT)
Displays dashes initially.
Displays box prompts if runway is entered into 1L prior to airport entry.
An invalid airport/runway pair will result in “NOT IN DATA BASE” displayed in

the scratchpad.

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

Navigation Aid Identifier (NAVAID IDENT)
Displays dashes initially.
Valid entries are up to 4 alphanumeric characters.
If the navaid is not contained in the databases, box prompts will appear in related

data fields needing entry.

SUMMARY
Push – displays NAV SUMMARY pages.
Blank if supplemental and temporary databases are empty.

Navigation Options (NAV OPTIONS)
Push – displays NAV OPTIONS page.
If the entered identifier is already stored in the permanent, supplemental, or temporary database, then relevant data propagates to the subsequent REF NAV DATA display.
If the entered identifier is not stored in any database, the subsequent REF NAV DATA display contains box prompts. Following entry of the required information, the new data may be stored in the temporary database by executing (except for runway data). Data may be subsequently deleted from the temporary database by deleting the individual identifier, if the identifier is not presently being displayed on another page (e.g., RTE LEGS, PROGRESS, etc.).
All data stored in the temporary database is cleared at flight completion.
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Flight Management, Navigation -FMC Cruise

Waypoint Data Display

Waypoint Identifier (WPT IDENT)
Displays or permits entry of the desired waypoint. When this entry is complete, the associated data lines are displayed.

LATITUDE/LONGITUDE
Displays or permits entry of waypoint latitude and longitude. Entry on the REF IDENT and RADIAL/DIST lines cause latitude and longitude to be computed and displayed.

Magnetic Variation (MAG VAR)
Displays or permits entry of waypoint magnetic variation. Data is automatically
computed based on latitude and longitude.
Manual entry has priority.

Reference Identifier (REF IDENT)
Together with RADIAL/DIST, displays or permits entry of reference point for a created waypoint.

INDEX
Push – displays REF NAV DATA page.

Radial/Distance (RADIAL/DIST)
Together with REF IDENT, displays or permits entry of bearing and distance for a created waypoint.
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Navigation Aid Data Display

Frequency (FREQ)
Displays or permits entry of the frequency of the entered navaid.

Navigation Aid Identifier (NAVAID IDENT)
Displays or permits entry of navaid identifier (5 characters maximum). Following entry, the associated data lines are displayed.

Classification (CLASS)
Displays or permits entry of the classification of the entered navaid.

ELEVATION
Displays or permits entry of the elevation (feet above MSL) of the entered navaid.
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Flight Management, Navigation -FMC Cruise 737 Flight Crew Operations Manual

Airport Data Display

Runway Identifier (RUNWAY IDENT)
Permits entry of runway identifier.

Airport Identifier (AIRPORT IDENT)
Displays airport identifier.

ELEVATION
Displays or permits entry of the elevation (feet above MSL) of the entered airport.
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Runway Data Display
A runway identifier may be entered on the airport data display page or as a waypoint on the REF NAV DATA page. On the airport data display page, entry may be in the form of 13R or RW13R. Single digit entries are possible, with or without leading zeros.If the waypoint method is used, entry must be in the form RW13R, and the proper airport identifier must be entered on the runway data display page. Runways must be stored in the permanent navigation database.

Runway Identifier (RUNWAY IDENT)
Displays runway identifier.
　
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