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estimate of wind speed, direction, ground speed, and track angle The operator should
update present position immediately because it is possible that significant navigation errors may
have accumulated.
MN C,R,S, or A failure has occurred and the BACKUP mode, used for manual navigation (MN), is
H followed the only means of valid navigation. The operator may use the computer as a dead
by a reckoning device by entering ground speed and track data. The operator should
numeric update present position immediately because it is possible significant navigation
code errors may have accumulated.
NG C,R,S, or A failure has occurred in the system and the operator should not use the system.
H followed
by a numeric
code
EN The 9 V battery has failed All stored data must be reentered. This display may be
cleared by pressing the KYBD pushbutton.
3-42 Change 3
TM 1-1520-238-10
d Entering UTM DATA. Enter the following initial data
(para 3.14.3.b) before navigating with the doppler:
(1). Spheroid of operation, when using UTM coordinates.
(2). UTM coordinates of present position zone, area,
easting (four significant digits), and northing (four
significant digits). Latitude/ longitude
coordinates may be used.
(3). Variation of present position to the nearest onetenth
degree.
(4). Coordinates of desired destination 0 through 5
and H (6 through 9 are normally used for target
store locations but may also be used for
destinations). It is not necessary to enter all
destinations in the same coordinate system.
NOTE
It is not necessary to enter destinations unless
steering information is required; unless, it is desired
to update present position by overflying a
destination; or, unless a present position variation
computation is desired (paragraph 3.14.7.g.). If a
present position variation running up-date is desired,
destination variation must be entered. The operator
may enter one or more destination variations to
effect the variation update. It is not necessary for all
destinations to have associated variations entered.
(5). Variations of destinations to be nearest onetenth
degree.
e. Entering Spheroid and/or Variation.
1. MODE selector switch - UTM (LATT/ LONG, or
BACKUP may also be used).
2. DISPLAY selector switch - SPH-VAR.
3. DEST DISP thumbwheel - P, numeral, or H, as
desired.
4. RYBD pushbutton Press. Observe display freezes
and TGT STR indicator blanks. Press KYBD pushbutton
again and observe left display blanks. If no spheroid
data is to be entered, depress KYBD pushbutton again
and proceed to step 6.
5. Enter Spheroid data. (Example: INO) Press keys 3
(left window blanks), 3, 5, 5, and 0. Left display should
indicate INO.
6. KYBD pushbutton Press. Observe right display
blanks. If no variation data is to be entered, press ENT
key.
7. Enter Variation data. (Example: E 01.2.) Press
keyboard 2 (right window blanks), 2, 0, 0, 1, and 2
display indicates NO E 01.2. Press ENT key. The entire
display will blank and TGT STR number will reappear.
Display should indicate INO E 01.2.
f. Entering Present Position or Destination In
UTM.
1. MODE selector switch - UTM.
2 DISPLAY selector switch - DEST-TGT
3. DEST DISP thumbwheel - P, numerical, or
H, as desired.
4. Enter present position and destination. (Example:
entry of zone 31T, area CF, easting 0958, and northing
3849.)
a. KYBD pushbutton Press. Observe that display
freezes and TGT STR indicator blanks
b. To enter zone 31T KYBD button Press. Observe
that center display blanks.
c. Keys 3, 1, 7, and 8 - Press.
d. To enter area CF, easting 0958, and northing
3849, KYBD button - Press. Observe left and
right displays blank.
e. Keys 1, 3, 2, 3, 0, 9, 5, 8, 3, 8, 4, and 9 - Press.
f. ENT pushbutton - Press. Left, right, and center
displays will momentarily blank and TGT STR
number will appear. Displays should indicate
31T CF 09583849.
Change 3 3-43
TM 1-1520-238-10
g. Entering Present Position or Destination
Variation In LAT/LONG. The variation of a destination
must be entered after the associated destination
coordinates are entered (since each time a destination is
entered, its associated variation is deleted). The order of
entry for present position is irrelevant
NOTE
If operation is to occur in a region with relatively
constant variation, the operator enters variation only
for present position, and the computer will use this
value throughout the flight.
1. MODE selector switch - LATT/LON
2. DISPLAY selector switch - DEST-TGT.
　
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