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key twice and enter the target speed. The maximum
target speed that may be entered is 50 knots. Fill leading
zeros before entering.
(6) To select the target direction depress the
KYBD key and enter the target direction.
(7) To end the entry operation depress the ENT
key. At the time ENT key is depressed and released, the
target position will begin to be updated as a function of
time based on the speed and direction entered.
NOTE
To abort/cancel an entry of target motion, enter
a target speed of 000 using the above
procedure.
j. Procedure for Entering/Displaying Datum or
Cleaning All Waypoints.
(1) Set the MODE switch to MGRS position
(LAT/LONG may also be used).
(2) Set the DISPLAY switch to DATUM/
ROUTE.
(3) To select the datum field depress the KYBD
KEY.
(4) Entry of datum: as an example consider
entry of 25. Depress keys LTR 2, 5. Depress the ENT key.
The display shall show DATUM:25.
(5) To clear all waypoints, variations, landing
data and target motions, enter RDW for the spheroid.
k. Procedure for Entering Sea Current Speed and
Direction for Water Motion Correction.
TM 1-1520-240-10
3-3-27
NOTE
In MGRS mode, wind speed is displayed in
km/hr; in LAT/LONG mode, wind speed is displayed
in knots. Leading zeros must be entered.
Sea current direction is defined as the
direction the current is flowing.
(1) Set MODE switch to LAT/LONG (MGRS
may be used).
(2) Set DISPLAY switch to WIND-UTC/DATA
and observe the standard wind speed and direction display.
(3) Depress the ENT key twice to display the
selection menu.
1>SEA CURRENT
2>SURFACE WIND
3>GPS STATUS
4>DATA LOAD end
(4) Depress the 1 key to select SEA CURRENT.
The display indicates:
SEA CURRENT
SP;XXXKn
DIR:XXX

(5) Entry of sea current speed and direction: as
an example, consider the entry 4 knots and 135 degrees.
Depress KYBD key. Observe that the speed field blinks.
(6) To enter speed, depress keys 0, 0 and 4. The
speed indicates 004Kn. The maximum sea current
speed that may be entered is 50 knots.
(7) Depress KYBD key. The direction display
blinks.
(8) To enter direction, depress keys 1, 3, and 5.
Direction indicates 135
.
(9) Depress ENT key. The display momentarily
blinks and then reappears.
NOTE
To abort entry of sea current, enter a sea current
speed of 000 using the above procedure.
l. Procedure for Entering Surface Wind Speed and
Direction for Water Motion Correction.
NOTE
Not required or necessary when in combined
or GPS mode. In MGRS mode, surface wind
speed is entered in km/hr: in LAT/LONG
mode, surface wind speed is entered in knots.
Leading zeros must be entered. Wind direction
is defined as the direction from which the
wind originates.
(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 twice to display the selection
menu.
1>SEA CURRENT
2>SURFACE WIND
3>GPS STATUS
4>DATA LOAD end
(4) Depress the 2 key to select SURFACE
WIND. The display indicates:
SURFACE WIND
SP:XXXKn
DIR:XXX

(5) Entry of wind speed and direction: as an
example, consider the entry of 20 knots and 150 degrees.
Depress KYBD key. Observe that the wind speed
field blinks.
(6) To enter speed, depress keys 0, 2 and 0. The
wind speed indicates 020. The maximum surface wind
speed is 50 knots.
(7) Depress KYBD key. The direction display
blinks.
(8) To enter direction, depress keys 1, 5, and 0.
Wind direction indicates 150
.
(9) Depress ENT key. The display momentarily
blinks and then reappears.
NOTE
To abort entry of surface wind speed and direction,
enter a surface wind speed of 000
using the above procedure.
3-3-51. Flight Procedures.
NOTE
This procedure is applicable to the Doppler
only mode. Present position is automatically
updated when DGNS is in combined mode.
a. Updating Present Position from a Stored Destination.
NOTE
The preface is: The aircraft is flying to a destination,
that is, the FLY-TO Destination is set
to the number of the desired destination.
(1) Set DISPLAY switch to DIST/BRG/TIME
position. Distance, bearing and time-to-go to the fly-to
destination are displayed.
(2) When the aircraft is over the destination,
depress KYBD key. Observe that the display freezes.
TM 1-1520-240-10
3-3-28
(3) Position update can be effected by depressing
　
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