(b)  
For NCD DME distance, the numeric readout is replaced by dashes.

 (c)  
For invalid DME distance or frequency, the DME legend and readout are removed.

 (20)
 FMC-Radio Update Mode

 (a)  
FMC-radio mode information is annunciated by a green colored display.

 (b)  
One of the following FMC-radio update modes can be displayed. LOC GPS (LOCALIZER GPS) LOC DD (LOCALIZER DME-DME) LOC VD (LOCALIZER VOR-DME) LOC (LOCALIZER) GPS (GLOBAL POSITIONING SYSTEM) DD (DME-DME) VD (VOR-DME)

 (21)
 FMC-IRS Update Mode

 (a)  
FMC-IRS mode information is annunciated by a green colored display.

 (b)  
The IRS update method is annunciated by either IRS(3), IRS(L), IRS(C) or IRS(R). The annunciations correspond to either triple IRS updating or single IRS updating.

 (22)
 Airplane Reference

 (a)  
Airplane position is indicated by the apex of the triangular symbol.

 (b)  
This point is the center of rotation and translation for all of the background and dynamic symbols.

 (c)  
For NCD or invalid airplane present position, the symbol is removed and the MAP flag (Fig. 12B) is displayed.

 (23)
 Source Annunciation

 (a)  The system source for map data is annunciated by a green colored display if the L, C, R CDU is selected as the system source.
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747-400 MAINTENANCE MANUAL
 (b)  
One of the following source annunciations may be displayed. CDU L CDU C CDU R

 (c)  
For invalid map data from the selected source, the map display is removed and the MAP flag (Fig. 12B) is displayed.

 (24)
 Weather Radar Data

 (a)  The weather radar mode, tilt angle and gain are displayed by green colored readouts. This data is displayed when the weather radar is selected on.

 (25)
 Weather Radar Return

 (a)  
Weather radar data is received by the navigation display directly from the weather radar system.

 (b)  
The data received from each weather radar scan is plotted along with the map background data at the proper scale.

 (c)  
If a mis-match is detected between the map scale and the weather scale, the weather radar returns are removed.

 (d)  
Between scans, the weather radar data is rotated and translated so that the proper orientation and distance from the airplane symbol is maintained.

 (26)
 Selected Heading

 (a)  
The AFDS Mode Control Panel selected heading is displayed by a magenta colored bug and vector.

 (b)  
The bug and vector are displayed full time except when the engaged AFDS roll mode is LOC, ROLLOUT, or VNAV. For these modes, the bug is displayed for ten seconds after the selected heading is changed.

 (c)  
For NCD or invalid AFDS Mode Control Panel selected heading, the bug and vector are removed.

 (27)
 EXCESS DATA message

 (a)  If more map symbols are selected than can be displayed, the EXCESS DATA message will appear. The EXCESS DATA message is yellow in color.

 (28)
 TCAS Intruder Symbols:

 (a)  There are four TCAS intruder symbols:
 -Resolution Advisory (red square with red fill),
 -Traffic Advisory (yellow circle with yellow fill),
 -Proximate Traffic (white diamond with white fill),
 -No Threat (white diamond with no fill).

 (29)
 Vertical Speed Arrow: An arrow shown with the TCAS intruder symbols. The arrow represents the vertical speed and direction needed to avoid a collision. The arrow is the same color as the applicable symbol.

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