TM 55-1510-221-10
10.
11.
12.
13.
INSERT/ADVANCE push-
button - Press. Observe arc-
seconds related to present
position latitude and longi-
tude, to nearest tenth of a
second, appear in left and
right data displays, respec-
tively.
Load related arc-second val-
ues for latitude in sequence,
starting with N. Example:
35.8° North = N 358.
INSERT/ADVANCE push-
button
- Press. Observe
INSERT/ADVANCE
and
HOLD pushbuttons remain
illuminated.)
Load related arc-second val-
ues
for
l o n g i t u d e in
sequence, starting with E.
Example: 20.1° East = E
201.
NOTE
Extra precision values are added to nor-
mal values and normal displays are not
rounded off.
NOTE
Normal latitude-longitude coordinates
must always be loaded prior to extra pre-
cision values.
NOTE
Directions N or S and E or W
are established during normal coordinate
entry. Either key may be used to initiate
entry during extra precision loads and
values will be added to extra precision
values without affecting direction.
NOTE
It is characteristic of the computer display
routine to add 0.2 arc-seconds to any dis-
play of 59.9 arc-seconds. Value in com-
puter is loaded by operator.
14. Proceed to step 6 in proce-
dure:
Normal Geographic
Present Position Check and
Update.
update:
(c.)
UTM present position check and
UTM data may
and, until final
reloaded.
1.
2.
NOTE
be loaded in any order
entry, a value may be
Data selector - UTM POS.
Observe UTM coordinates
of present position appear in
data displays.
HOLD pushbutton - Press
(when aircraft passes over
known position reference.)
Observe HOLD pushbutton
light illuminates. Coordi-
nates in data display freeze
at
values present when
HOLD pushbutton
was
pressed.
NOTE
While HOLD pushbutton light is illumi-
nated, TACAN, GPS and data link
updates are inhibited.
3.
4.
5.
6.
Load zone and easting by
pressing keys in sequence,
starting with E. Example:
Zone 16, 425 km East =
E16 425. Observe zone and
easting in kilometers appear
in right data display as keys
are pressed.
INSERT/ADVANCE push-
button
- Press. Observe
INSERT/ADVANCE push-
button light remains illumi-
nated.
Load northing by pressing
keys in sequence, starting
with N or S to indicate
north or south hemisphere.
Example: North 4749 km =
N 4749. Observe northing
kilometers appear in left
data display as keys are
pressed.
INSERT/ADVANCE push-
button
- Press. Observe
INSERT/ADVANCE push-
button light remains illumi-
nated.
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