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GPS Status.
(1) Set MODE switch to LAT/LONG (MGRS
may also be used).
(2) Set DISPLAY switch to WIND-UTC/DATA
and observe the wind speed/direction display.
(3) Depress ENT key. Observe that the CDU
display indicates year XX, day XXX and indicates hours,
minutes, and seconds of UTC time: XX Hours, XX Minutes,
XX Seconds.
(4) To enter year, day, and time depress the
KYBD key to select the field for input shown as a blinking
field, enter the desired data and depress the ENT key.
(5) To display GPS status depress the ENT to
display selection menu.
1>SEA CURRENT
2>SURFACE WIND
3>GPS STATUS
4>DATA LOAD end
(6) To select the GPS STATUS page depress
the 3 key.
TM 1-1520-240-10
3-3-22
(7) Observe the CDU display. The display indicated
the GPS test mode status as of one of the following.
GPS TEST: IN PROCESS
GPS TEST: NOT RUN
GPS TEST: PASSED
GPS TEST: FAILED
g. Procedure for Displaying GPS Key and GPS
Space Vehicle Status.
(1) Set the DISPLAY switch to XTK/TKE/KEY.
(2) Set the MODE switch to LAT/LONG (MGRS
may also be used).
(3) The display indicates GPS daily key status,
time remaining on the currently entered keys and how
many Space Vehicles (SV) are currently being used by
the GPS.
KEY STATUS TIME REMARKS
DK OK Days or hours still
available on key
GPS daily key
in use and
verified.
DK NO * No GPS daily
key available
DK IN * GPS daily key
available but
not verified.
3-3-50. Preflight Procedures.
a. Data Required Prior to DGNS Turn-on
The following initial data must be entered by the pilot after
system turn-on and initialization, unless previously entered
data is satisfactory:
Datums of operation, when using MGRS coordinates.
This data may be part of the data load if preprogrammed.
In combined or GPS mode the GPS provides preset position.
If Doppler only mode is selected MGRS coordinates
of present position - zone area, easting and northing;
latitude/longitude coordinates may also be used to input
present position. This data may be part of the data load
if preprogrammed. Variation of present position to the
nearest one-tenth of a degree.
Coordinates of desired destinations 00 through 99. It is
not necessary to enter all destinations in the same coordinate
system. This data may be part of the data load if
preprogrammed.
Variation of destinations to the nearest one-tenth of a
degree.
Crypto-Key variables necessary to enable the GPS receiver
to operate in Y code are entered via remote fill data
only and not via the CDU keyboard.
NOTE
Destinations are entered manually when
steering information is required to a destination
that was not in the set of data loaded via
the data loader, or it is desired to update present
position by overflying a destination, or a
present position variation computation is desired.
(See CDU operation). If a present position
variation update is desired, destination
variation must be entered. The operator may
enter one or more destination variations; it is
not necessary for all destinations to have associated
variations entered and also not necessary
to enter all destinations in any case,
but variations must be entered AFTER destination
coordinates are entered.
The Doppler outputs true heading and accepts magnetic
heading from gyromagnetic heading reference. If accurate
magnetic variations are not applied, then navigation
accuracy will be affected.
b. System Initialization
(1) Enter GPS mode “M”.
NOTE
You must select GPS mode “M” during initialization.
If “Y” mode is selected before Crypto-
Key variables are loaded the system will lockup
forever.
You must select GPS mode “M” during initialization.
If “Y” mode is selected before Crypto-
Key variables are loaded the system will lockup
forever.
(2) Perform self test (para d. below).
(3) Perform download (para c. below) of data
loader cartridge if necessary, or manually enter datum,
destinations, magnetic variations, and present position
(para. f or g. below).
(4) Load Crypto-Key variables (unless previously
loaded and still valid) necessary for operation of
the GPS in Y mode.
NOTE
It is necessary to wait at least 12 minutes for
key validation when new keys have been entered,
or collection of almanac data when set
has no previous almanac data. During this
time the GPS operating mode must be M and
uninterrupted. After this time the GPS operating
　
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