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HSI display. At aircraft power-up/WonW, the system initializes to Map boxed (On), Centered, T UP,
and 40 nm scale.
24.1.3.2.1 MAP Operating Mode Option. This multifunction option combines the Chart (CHRT),
Digital Terrain Elevation Data (DTED), and Controlled Image Base (CIB) map operating modes into
a single option. See figure 24-2.
24.1.3.3 MODE Backup. If aircraft magnetic heading or aircraft horizontal velocities become invalid,
the HSI format is limited to a Centered North-up mode and the T UP and DCTR legends are removed
and selection inhibited from the HSI Mode sublevel. The ``N Up'' legend on the HSI Mode sublevel is
boxed under this condition. When aircraft magnetic heading and aircraft horizontal velocities become
valid, the HSI format is driven to the currently selected mode and the T UP, N UP and DCTR legends
are provided and processed on the HSI Mode sublevel.
NOTE
The currently selected HSI format mode option remains unchanged
when the aircraft magnetic heading or aircraft horizontal velocities
become invalid.
A1-F18EA-NFM-000
VII-24-2 ORIGINAL
Figure 24-1. Navigation Controls and Indicators (Sheet 1 of 2)
A1-F18EA-NFM-000
VII-24-3 ORIGINAL
Figure 24-1. Navigation Controls and Indicators (Sheet 2 of 4)
A1-F18EA-NFM-000
VII-24-4 ORIGINAL
Figure 24-2. TAMMAC Mode Selections
A1-F18EA-NFM-000
VII-24-5 ORIGINAL
24.1.3.3.1 MAP Modes/Data Products. Each of the map modes (CHRT, DTED, and CIB) provides
a different plan-view map/image. The actual presentation and availability of the different maps/
images are independent and mutually exclusive. Only one map mode can be selected at any one time.
The detailed images and associated area coverage for each mode are dependent on the map (theater)
data loaded in the DMS or installed on the mission card. Each plan-view map, regardless of mode,
presents an image that can support moving map capability and/or slew mode functions. When toggling
through the different modes, different map images are available providing the mode specific data is
loaded/available for that particular geographic position and scale. The map modes and their associated
data products are:
1. Chart (CHRT) mode provides a plan-view color map derived from Compressed ARC Digitized
Raster Graphics (CADRG). This chart product replaces the Compressed Aeronautical Chart (CAC)
map data currently used in the existing map (AN/ASQ-196).
2. Digital Terrain Elevation Data (DTED) mode provides a plan-view, panchromatic (gray scale),
terrain plot with slope shading.
3. Controlled Image Base (CIB) mode provides a plan-view panchromatic image derived from a
variety of mission planning, command, control, communications, and intelligence systems.
24.1.3.4 Map Data. The MDATA option is provided on the HSI/DATA sublevel format. MDATA is
boxed when selected and remains boxed until A/C, WYPT, TCN, HSI, or INS CK is selected. When
MDATA is selected, the DATA option is provided on the UFCD. When MDATA is selected on the
HSI, all DDI/MPCD/UFCD with the HSI format are driven by the DMS mono-map and the data
frames written in raster. The number of data frames is limited to 100.
24.1.3.4.1 Map Orientation Option. This option is a multifunction option that combines the Track
Up (T UP) and North Up (N UP) map orientation functions into a single option. Successive selections
of the orientation option toggles the map between these two orientations as they are mutually
exclusive. The T UP orientation is the default orientation. The DMS mono-map output contains the
same information as the DMS color output (except for color), including cautions if they are provided
with the color output. See figure 24-2.
24.1.3.5 SLEW Option (HSI Format). When map update is selected from the cockpit, the TDC is
assigned to the slew function. When map update is selected from the rear MPCD, the LDC is assigned
to the slew function (if the left DDI has malfunctioned the right designator control (RDC) is assigned).
When map update is selected from the right or left DDI the RDC or LDC, respectively, is assigned to
the map slew function. When map update is selected, MAP is automatically boxed and when selected
on a DDI, all DDIs and MPCDs displaying the HSI display are commanded to be driven by the DMS
monochromatic map.
When WYPT slew is selected from the cockpit, the TDC is assigned to the MAP Slew function for
waypoint update. When WYPT Slew is selected from the aft MPCD, the LDC is assigned to the MAP
slew function for waypoint update (if the LDDI is not communicating on the AVMUX, the RDC is
assigned). When WYPT Slew is selected from the right or left DDI, the RDC or LDC, respectively, is
assigned to the map slew function for waypoint update. When WYPT Slew is selected, MAP is
　
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