ARMY TM 5-6675-308-12
MARINE CORPS TM 08837A-12/1A
PRESS ENT
::
"LA"
.00
SPH 106 = Malayan Spheroid, Geographic Coordinate
System
Example: Enter a latitude value of +34 10' 19.27"
SPH 107 = Australian National Spheroid, Geographic
Coordinate System
DATA
OPERATOR
DISPLAY
ACTION
d. After the proper spheroid is selected, the display
will indicate the last vehicle in use. Refer to paragraph
::
.00
"LA"
(PADS cue)
gitude position with a flashing "LO". East of Greenwich is
PRESS N
::.
LA "-"
is defined as positive (eastern hemisphere) and west of Green-
PRESS +
LA
::.
which is defined as negative (western hemisphere). Only the
negative (-) sign will be displayed for western hemisphere
PRESS 3
LA
: : .3
operation. If no convention sign is displayed in geographic
PRESS 4
LA
::
.34
coordinate position, it will be assumed to be positive.
PRESS 1
LA
: 3.41
--
PRESS 0
LA
:34.10
NOTE
Since operation in the geographic coordi-
PRESS 1
LA
: 3:41.01
nate system is for survey missions only,
PRESS 9
LA
:34:10.19
the two position azimuth mark (para-
graph 3-17) and distance traveled displays
LA
PRESS 2
3:41:01.92
are not activated. The CDU will display
LA
34:10:19.27
PRESS 7
dashes (--) when DIST is pressed by the
operator.
Check that the data is correct before pressing ENT.
When operating in the geographic coor-
PRESS ENT
"EL"
.0
dinate system, the CDU azimuth displays
NOTE
are in degrees, minutes, and seconds. Par-
agraphs 3-18 through 3-20 must, there-
The remainder of the cueing and entry is
fore, be performed using the theodolite
identical to operation in the UTM grid
with entry in degrees, minutes, and sec-
coordinate system. Refer to paragraph
onds. (Mils must be converted to degrees,
minutes, and seconds before entry.)
a. The operator recognizes a cue by pressing the
pushbutton corresponding to the flashing symbol. The
displayed symbol stops flashing and the zero(s) goes
blank. Enter data with the numeric pushbuttons. Each
numeral enters the display at the extreme right and
moves one space to the left when a new digit is entered.
Failure to perform zero-velocity correc-
tions when requested may cause survey
h. If a wrong number is entered, press CLR to clear
mission failures.
the display. When all numerals are entered, check that
the data is entered correctly. If possible, use a second
NOTE
person to check the entry. Press E N T to enter the data
into the system. The display will show a new message.
Zero-velocity correction should be per-
formed whenever the vehicle is stopped.
c. To operate in the geographic coordinate system,
Frequent (corrections improve survey
the flashing "SPH"' must he responded to by adding 100
accuracy.
to the selected survey spheroid. Therefore:
Helicopters must land for zero-velocity
SPH 101 = Clarke 1866 Spheroid, Geographic Coordi-
corrections.
nate System
a. Zero-velocity corrections are needed for accurate
SPH 102 = Clarke 1880 Spheroid. Geographic Coordi-
surveying. One begins automatically during initializa-
nate System
tion Thereafter, PADS requests zero-velocity correc-
SPH 103 = International Spheroid, Geographic Coordi-
tion stops at 10-minute intervals. PADS automatically
nate System
performs a zero-velocity correction at all mark and
update procedures.
SPH 10-1 = Bessel Spheroid, Geographic Coordinaite
System
b. PADS requests a zero-velocity correction by flash-
ing the GO and STOP indicators and beeping ALARM
SPH 105 = Everest Spheroid, Geographic Coordinate
DS3 30 seconds before the next required correction. The
System
3-15
Change 2
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