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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
MAG VAR computation is desired. If a
present position MAG VAR running update is
desired, destination MAG VAR 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 MAG VAR entered.
e. Variation of destinations.
3-3-17. Entering Spheroid and/or Variation.
a. MODE selector — UTM, LAT/LONG or BACKUP.
b. DISPLAY selector — SPH-VAR.
c. DEST DISP thumbwheel — P, numeral, or H as
desired.
d. KYBD 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, KYBD pushbutton —
Press again, go to step g.
e. Spheroid data (table 3-3-3) — Entry. (Example:
IN0). Press keys 3, 3, 5, 5, and 0. Left display should
indicate IN0.
f. ENT key — Press if no variation data are to be
entered.
g. KYBD pushbutton — Press, if variation data is to
be entered, and note right display blanks.
h. Variation data — Enter. (Example: E001.2, press
keyboard keys 2, 2, 0, 0, 1 and 2. Press ENT key, the
entire display will blank and TGT STR number will reappear,
display should indicate IN0 E001.2.)
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.
Table 3-3-3 Spheroid Data Codes
SPHEROID CODE AREA COVERED
CLARKE 1866 CL6 United States
north through
North Pole
CLARKE 1880 CLφ Africa west
through Algeria
TM 1-1520-240-10
3-3-11
Table 3-3-3. Spheroid Data Codes (Continued)
SPHEROID CODE AREA COVERED
INTERNATIONAL INφ All of Europe, Saudi
Arabia, Greenland,
South America, Indian
Ocean, Pacific
Ocean, and Atlantic
Ocean.
BESSEL BEφ Indonesia, Manchurian,
to Eastern Russia.
EVEREST EVφ Mt. Everest, India,
and Pakistan
AUSTRALIAN AUφ Australia
NATIONAL
3-3-18. Entering Present Position or Destination in
UTM.
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.
a. MODE SELECTOR — UTM.
b. DISPLAY selector — DEST-TGT.
c. DEST DISP thumbwheel — P, numeral, or H as
desired.
d. Present position and destination — Enter. (Example:
Entry of zone 31T, area CF, easting 0958 and northing
3849).
(1) KYBD pushbutton — Press. Observe that
display freeze and TGT STR indicator blanks.
(2) KYBD pushbutton — Press. Observe that
center display blanks.
(3) Key 3, 1, 7, and 8 — Press.
(4) KYBD pushbutton — Press. Observe left
and right displays blank.
(5) Key 1, 3, 2, 3, 0, 9, 5, 8, 3, 8, 4, 9— Press.
(6) ENT key — Press. Left, right and center displays
will momentarily blank and then display CF 0958,
3849, 31T, respectively, TGT STR number will appear.
3-3-19. Entering Present Position or Destination 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.
a. MODE selector — LAT/LONG.
b. DISPLAY selector — DEST-TGT.
c. DEST DISP thumbwheel — P, numeral, or H as
desired.
d. Present position or destination — Enter. (Example:
Entry of N41
10.1 minutes and E035
50.2 minutes.)
(1) KYBD pushbutton — Press. Observe that
display freezes and TGT STR indicator blanks.
(2) KYBD pushbutton — Press. Observe that
left display blanks.
(3) Key 5, 5, 4.1, 1, 0, and 1 — Press.
(4) KYBD pushbutton — Press. Observe right
display blank.
(5) Key 2, 2, 0, 3, 5, 5, 0, and 2— Press.
(6) ENT key — Press. Left, right, and center
displays will momentarily blank and TGT STR number
will reappear. Displays should indicate N41
10.1 E035

50.2.
3-3-20. Entering Ground Speed and Track.
a. MODE selector — BACK UP.
b. DISPLAY selector — GS-TK.
　
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