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ST switch on the ORT LHG.
The coordinate data are displayed as four pages of a
coordinate data menu. The various pages may be paged
by using the SPACE key on the DEK. An example page
is shown below:
a. Store Coordinate Data Using DEK. To enter
data input the appropriate coordinate data address.
The cursor will jump to the first position for data entry,
i.e., grid zone. Either input the specific grid zone or use
the SPACE key for automatic entry if the coordinate
data grid zone is the same as the aircrafts current present
position of the 100 KM ID; either input the data or
use the SPACE key followed by the eight or six-digit
coordinates. Pressing the SPACE key will automatically
enter the A for the altitude. If the altitude of the coordinate
data is above sea level directly input the numbers;
if necessary a leading zero is required. The plus
4-18 Change 4
sign will be automatically entered; if coordinate data is
below sea level the minus sign must be input prior to
the numeric value.
If a particular storage location has no data the message
NO DATA will be shown. If it is desired to clear a specific
storage location, key in the letter C followed by the
desired coordinate data storage location address. The
location will be cleared and the message NO DATA will
be displayed.
b. Storing Coordinate Data Using UPDT/ST
Switch.
1. Waypoint/target index - Desired storage location.
2. Enter range, aircraft to waypoint/target.
NOTE
Range to geographic feature or object
must be input to the FCC. This may be accomplished
by three means: 1. Manual
range input through the keyboard (determined
from a map or by estimation); 2.
Automatically calculated range based on
LOS angles from selected sight; 3. Laser
range input by tiring the laser after placing
reticle on feature or object (This is the
most accurate range data).
3. Place reticle of selected sight on the geographic
feature or object.
4. UPDT/ST - ST (Waypoint/target coordinate
data will be automatically calculated and
placed in the location specified by the index.)
4.17.3 Waypoint/Targeting Position Update.
a.
NOTE
This subsystem of the waypoint/targeting
calculates the present position of the helicopter
based on previously stored coordinate
data. The update present position is
stored within the FCC and NOT automatically
sent to the doppler navigation system.
Position Update.
1. Waypoint/target indexer - index of location of
previously stored coordinate data.
2. Enter range, helicopter to coordinate data.
See explanation under storing coordinate data
[para 4.17.1 (2)].
3.
4.
Place reticle of selected sight on the geographic
feature or object of previously entered
coordinate data.
UPDT/ST - UPDT. (The aircraft present
position is calculated automatically, based on
the previously entered coordinate data.)
b. Recall Updated Hellcopter Present Position.
1. Data entry keyboard - SP1.
2. Input - U (The updated present position data
is automatically displayed.)
c. Update Doppler.
1.
2.
3.
Waypoint/target indexer - Index of desired
coordinate data.
Acquisition Select - TGT or NAV.
Slave button - Press.
1. Recall updated aircraft present position immediately
after accomplishing update function.
2. Insert the FCC displayed present position into
the doppler using normal procedures.
a. If the selected sight was TADS, TADS will
be slaved so as to place its LOS reticle over
the geographic feature or object on the
ground.
b. If the selected sight was other than TADS,
the CPG will be cueing in the normal manner
so as to cue the CPG to place the reticle
of his selected sight over the geographic
feature or object.
d. Example of Updated Present Position Data. b. Recall Range and Bearing, Hellcopter Present
Position to Stored Coordinate Data.
1. Input - U.
2. Display After Entering: UPDATE
A/C 11S QG56035160
1. Data entry keyboard - TGT.
2. Input - Rn. (Where n = coordinate data storage
address.)
c. Example.
1.
2.
Input - R3.
DELEAS = +0065 After entering, display shows - 3R 15990
B042.4 degrees.
DELNOR = -0012 Which decodes as follows:
3. Which decodes as follows:
a. Waypoint/target storage (index) No.-3.
b. Range, helicopter to coordinate data -
15990 meters.
Grid Zone - 11S
Coordinates - QG56035160
c. Bearing, helicopter to coordinate data -
042.4 degrees.
NOTE
Doppler easting error - +65 meters
　
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