3.  
INIT LAT/LONG soft key -Press to correct location, if not correct in screen. Enter correct coordinates in scratch pad.

4.  
ENT -Press to enter position in system.

3.4.3.2.2 Initializing the Doppler Sensor. As the sys-tem powers up and the screen is .rst displayed, the initial position (as determined from non volatile memory) is used to initialize the Doppler portion of the DGNS. When the GPS completes an initial .x in the DO/GPS blended mode (the default mode) the Doppler sensor will be updated to the GPS position.
3.4.3.2.3 Initialization of the GPS Sensor. At power up the GPS sensor will automatically attempt to perform a .rst .x using its internal stored position, time, and almanac data. If the helicopter is moved from its shutdown position, this will cause delay in initializing. The GPS position will be updated each time the initial position .elds are edited on screen. The CDU will not modify the GPS time or date but will echo back the GPS reported time and date on the ini-tialization screen. A full initialization of the GPS sensor
(i.e. position, time, date, and almanac if necessary) requires that the operator command a GPS initialization via the sen-sors SNSGPS screen.
3.4.3.3 Horizontal Datums. The CDUs store and pro-cesses position information based on WGS-84 datum and spheroid. Each pilot must individually select the local da-tum for CDU position entry and presentation that corre-sponds to the horizontal datum listed on the tactical map being used for the mission. Navigation information is pro-cessed based on the BC CDU active datum, ignoring the datum of the RT CDU.
1. To change a horizontal datum in CDU go to the local datum screen from the DUSTOFF UH60Q screen (Figure 3-6), enter the desired datum number in the scratchpad, and ENT key -Press.

3.4.3.4 Magnetic Variation.

An improper MAG VAR setting will af-fect the navigation accuracy of the Dop-pler present position (PPS).

Use the AUTO setting whenever the ASN-43 Compass System is set to SLAVED (i.e. Magnetic Heading) (Figure 3-7). If the ASN-43 is set to DG and manually slewed to true north, then the CDU MAG VAR should be set to MAN with an entered variation of 0.0 degrees.
3.4.3.5 Load Data.
NOTE
Waypoints, presets, .ight plans, etc. will be changed on the cartridge only if the DTS STATUS screen SAVE soft key is pressed.

If a cartridge is placed in the DTS after power up the pilot must initiate a mission data load. A full mission data load takes about a minute (about 30 seconds for the mission data and the balance for maintenance data). The pilot does not have to wait for the full load to .nish before using the data, and may leave the download screen and do other op-erations. COM presets, for example, are available almost immediately. The DTM mission is loaded in the following order:
a.  
COM presets.

b.
Nav-points data.

c.  
Radio Nav Presets.

d.
Flight plans.

e.  
Recorded fault histories.

NOTE
The following steps are required only if the DTC cartridge was not loaded prior to power up.
1.
DTC cartridge -Load in DTS.

2.
On CDU, INI -Press.

3.  
DTS soft key -Press.

4.  
LOAD soft key -Press, to initiate mission data load.

3.4.3.6 Load ECCM and COMSEC Data.
NOTE
The following steps are required to load classi.ed key codes in AMS.
1.
Fill device -Attach to .ll port for appropriate radio.

2.
On CDU, INI -Press.

3.  
FILL soft key -Press.

4.
Soft key adjacent to radio designator, or KY-58,or KY-100 soft key -Press, to initiate .ll.

3.4.3.7 Status. Status screens give the pilot quick review of the status of all equipment controlled by AMS (Figure 3-8).
　
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