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the EGI is powered. If the GPS is keyed it may take as
long as 12 minutes to verify the key with the satellites.
The GPS receiver will provide position and time. The
Navigation System automatically configures to handle
the GPS and DNS velocities for velocity aiding of both
the EGI and HARS. When the GPS has tracked the
first satellite, it will provide the date and time to the
Navigation System. The date and time (ZULU) is displayed
at the top of the ADMIN page of the CDU. There
are no specific operator actions that may be taken with
the GPS.
3.16.3 Data Transfer Unit (DTU).
The Data Transfer Unit (DTU) is located in the aft portion
of the CPG right-hand console. The cartridge is
programmed using the Aviation Mission Planning System
(AMPS). The AMPS writes the coordinate files for
waypoints, targets, present position and laser codes to
the cartridge. In the helicopter, the FCC handles all
reading and writing to the cartridge. Whenever the
CPG makes changes to any of the data, the FCC will
automatically update the cartridge with the changes.
3-64 Change 4
This will preserve any changes made by the CPG in the
event of a power transient. On power-up, either initial
or following a transient, the FCC will check for copies of
the files it has written out to the data cartridge. If it
finds the saved files present, it will automatically load
all of the saved files. It the saved files are not found, the
FCC will load the AMPS files into the system. This has
the effect of automatically loading the AMPS files when
a “new” cartridge is used. The CPG has the capability of
manually loading and saving files by using the pages on
the CDU. FCC memory data may only be “dumped” by
powering down the FCC.
3.16.4 Required Navigation Data.
The Integrated Navigation System uses two components
of data for proper operation: map datum and altitude.
Magnetic variation is automatically calculated by
the Navigation System and requires no action by the
flightcrew. Spheroid is not used in any portion of the Integrated
Navigation System.
a. Altitude. Altitude is used with all coordinate
data to permit the accurate prepointing or cueing to
any of the coordinate data in the Navigation System. If
altitude is not entered and the coordinate data is used
to prepoint, the current helicopter altitude is used. The
range of altitude entry is -900 to +20000 ft. MSL.
b. Map datums. Map datums are mathematical
models of the Earth used to calculate the coordinates on
maps and charts. Currently, many datums are used
throughout the world to produce maps. The standard
for US Forces is World Geodetic System 1984 (WGS 84).
However, many US Military Grid Reference System
(MGRS) and foreign maps are still based on other daturns.
Not correcting for different datums can cause significant
errors. The coordinates for a point on the
Earth’s surface in one datum will not match the coordinates
from another datum for the same point. The Integrated
Navigation System requires that the datum be
entered with the coordinate data. If it is not entered, it
will default to the present position datum. The datum
included with each set of coordinate data allows the
Navigation System to calculate the compensations for
different datums. Multiple datums can be used and the
Navigation System will accurately generate the compensated
navigation or prepointing data. The datum
used is identified by a 2 digit number. Table 3-21 lists
all of the datums that may be used with the Integrated
Navigation System.
Table 3-21. Datum Names and Codes
Datum
Name/Description
Datum Code Used
By Navigation
System
Adindan 01
ARC 1950 02
Australian 66
Bukit Rimpah: Indonesia
Camp Area Astro
Djarkarta: Indonesia
European 1950
Geodetic Datum 1949 08
Ghana 09
03
04
05
06
07
Guam 1963 10
Gunung Segara: Indonesia 11
Gunung Serindung: Indonesia 12
Herat North 13
Hjorsey 14
Hu-Tzu-Shan 15
Indian: Mean Value For Thailand
And Viet-Nam
16
Ireland 1965 17
Kertau: West Malaysia 18
Liberia
Other International
Luzon
Merchich
Montjong Lowe: Indonesia 23
Minna 24
North American Datum of 1927 25
NAD 27 Alaska: Canada 26
Old Hawaii: Maui 27
Old Hawaii: Oahu 28
Old Hawaii: Kauai
Ordnance Survey of Great Britain
1936
Qornoq
Sierra Leone 1960
Campo Inchauspe: Argentina
29
30
31
32
33
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