TM 1-1520-238-10
Change 3
3-43
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 coordi-
nates.
(2). UTM coordinates of present position zone, area,
easting (four significant digits), and northing
(four significant digits). Latitude/longitude coor-
dinates may be used.
(3). Variation of present position to the nearest one-
tenth 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 destina-
tions). It is not necessary to enter all destina-
tions in the same coordinate system.
NOTE
It is not necessary to enter destinations un-
less 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 update is desired, destina-
tion variation must be entered. The operator
may enter one or more destination varia-
tions to effect the variation update. It is not
necessary for all destinations to have asso-
ciated variations entered.
(5). Variations of destinations to be nearest one-
tenth 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. KYBD pushbutton – Press. Observe display
freezes and TGT STR indicator blanks. Press
KYBD pushbutton again and observe left dis-
play 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 dis-
play 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 num-
ber 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. (Exam-
ple: 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 north-
ing 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.
