ARMY TM 9-6675-349-12&P
MARINE CORPS TM 11039A-12&P
SYSTEM STATUS &
Operation
F4 Legend
NXT ZUPT Time
MESSAGES
Stop vehicle and set brake. ZUPT or "ZUPT"
Counts down or 00:00
Press F4.
ZUPT or "ZUPT"
Counts down or 00:00
PRESS Y TO ZUPT
ZUPT COMPLETE IN:
Press Y.
ZUPT or "ZUPT"
Counts down or 00:00
xx SECONDS
ZUPT completed.
ZUPT
05:00 or 10:00
"-GO-"
Vehicle moves.
ZUPT
Counts down
c.
Operator has 15 seconds to stop the vehicle and initiate a ZUPT. If a ZUPT is not initiated within 30
seconds of NXT ZUPT time becoming 00:00, survey order will change to DGR, PERF. ERROR; SEE
STATUS will flash under SYSTEM STATUS & MESSAGES, and audible alarm will sound with a
different tone than for a ZUPT request.
(1) Press F8 to display STATUS page and, depending on survey order, will show:
ERROR: 4TH ORDER ZUPT INTERVAL EXCEEDED
STOP AT AN SCP AND UPDATE POSITION AND ALTITUDE;
OR SWITCH TO 5TH ORDER SURVEY (10 MINUTES BETWEEN ZUPTS ); or
ERROR: 5TH ORDER ZUPT INTERVAL EXCEEDED
STOP AT AN SCP AND UPDATE POSITION AND ALTITUDE
(2) Press F9 to exit to previous page.
(3) If 4TH order ZUPT interval was exceeded, a position update must be performed at a known SCP to
restore survey accuracy, or you may switch to 5TH order with reduced accuracy, paragraph 3-14c.
(4) If 5TH order ZUPT interval was exceeded, a position update must be performed at a known SCP to
restore survey accuracy.
d.
If vehicle moves before a ZUPT is completed, NXT TIME automatically reverts to the prior zero-velocity
countdown time.
3-15. Updating.
NOTE
An update may be cancelled any time before completion by pressing F9. A
completed update cannot be eliminated.
a.
Inserting accurate position and altitude data into IPADS is called updating. All updates are performed using
known survey control points. IPADS must be updated after initialization before it can provide accurate
survey data. The first update after initialization is called the initial update. The survey mission starts after
the initial update. It is essential to update IPADS at the end of a survey mission.
b.
At update completion, IPADS automatically adjusts all data recorded since the previous update. Adjusted
data are stored in the SCP database filter. Unadjusted data are stored in the USER DEF database filter with
the first character of the name changed to U.
c.
After the operator has entered the known trig list position and altitude data of the survey control point into
the IPADS, the system tests the difference between the update coordinates (trig list data) and the actual
IPADS position coordinates. If the difference (error) is within the acceptable tolerance, the update is
accepted.
