ARMY TM 5-6675-308-12
MARINE CORPS TM 08837A-12/1A
Section I l . OPERATION UNDER USUAL CONDITIONS
PADS may be initialized on slopes greater
cle. Helicopters are used in special situations, e.g., great
than 5 degrees with decreased alignment
distances between survey points, survey points inaccessible
accuracy.
to a land vehicle, or when speed is of paramount concern.
a. PADS must be initialized before it can survey.
Because operations in a land vehicle or helicopter are nearly
The operator enters the approximate PADS position.
the same, complete procedures are given only for a land
Then PADS automatically aligns.
vehicle mounted PADS. Transfer between vehicle and heli-
copter is described. Special helicopter operating considera-
b. The initialization site must have a firm surface
tions are covered.
level to 5 degrees. The site horizontal position coordi-
nates should be known to 100 meters and the eleva-
tion known to 10 meters. Initialization takes 30 to 45
minutes, depending upon ambient temperature.
cedures are summarized in table 3-2. The mission be-
gins with pre-turnon checks and services, followed by
c. Vehicle movement and shocks must be avoided
initialization. Next, PADS is updated, using the position
during alignment. The parking brake must be firmly set and
and elevation update procedure. PADS then performs a
the front wheels pointed straight. The vehicle should face
series of marks, where position, elevation, and azimuth
into high winds with the wheels blocked. After entering the
are recorded. Update, data recall, and shutdown com-
site coordinates, the operator should leave and remain clear
pletes the mission. Table 3-2 references paragraphs,
of tile vehicle until alignment is completed. The initializa-
tables, and figures where mission phases are explained
tion sequence is shown in step 2 of table 3-2.
in detail. If a malfunction occurs, refer to table 4-2,
Troubleshooting.
d. If excessive vehicle movement is experienced
during alignment, the ATTN indicator will light and
3-5. Initialization.
the CAL indicator will go off, the ALARM DS3 may
sound, or the STOP and GO indicators may flash alter-
nately. If this occurs, turn PADS off, wait 2 minutes,
then restart the initialization procedures.
PADS must not be moved for at least one
minute after turn on. Failure to do this
m a y result in severe damage to the
e. If the vehicle is not level within 5 degrees,
equipment.
the display will show LEVEL starting in monitor
PADS must be initialized on a firm, level
MODE 3. The LEVEL display locks out the
surface. Alignment failure can result from
monitor mode unless a malfunction occurs. Turn
vehicle movement on soft surfaces such as
PADS off, wait 2 minutes, and move vehicle to a
mud, snow, or ice, and shocks caused by
more level area and reinitialize. If this is not possi-
operator movement or wind gusts. The
b l e , PADS will continue to align with possible
operator should stand clear of the vehicle
degraded accuracy. The LEVEL display will go off
during alignment. The vehicle should be
at MODE 8. Remember, initialization coordinates
facing into high winds with the wheels
must be known only to 100 meters. The system
blocked.
does not have to be initialized directly over a
To prevent damage, do not move PADS
survey control point (SCP). Thus, it usually will be
for at least 2 minutes following shutdown.
possible to find a level area for initialization. Up-
Defer shutdown if it is not possible to
dates must be done over a known SCP.
wait.
NOTE
To speed warm-up and improve align-
ment accuracy, PADS may be turned on
NOTE
before leaving for the initialization point
with the understanding that total mission
The following conventions are used in
time is decreased. Do not enter spheroid
data until vehicle is parked at the initial-
ization point. Alignment starts when
1 . CDU pushbuttons are underlined, e.g.,
STOP.
spheroid is entered.
Change 2
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