POS MV V5 Installation and Operation Guide
Patch
Test
Copyright © Applanix Corporation, 2017
F-2
Figure 119: Ideal Survey Calibration Area
Calibration
The procedure outlined in this appendix includes a calibration check on the following parameters. Perform
the following:
•
Roll
measurement
•
Position time delay
•
Gyrocompass
heading
•
Pitch
measurement
Roll
Calibration
Complete the gyrocompass calibration routine and remove any offset that may exist.
1. Sail a line to survey the flat region of the test area (A to B of Figure 119 on page F-2).
2. Turn through 180° and sail a reciprocal course along the same line. Log this line separately from
the first survey line.
3. Use the multibeam software and select a single point along both survey lines (point O of
Figure 119 on page F-2). Examine the profile of the seabed perpendicular to the course of the
vessel at this point (the line X
–
X of Figure 119 on page F-2) and confirm that both survey lines
show the same seabed profile. They should be substantially coincident as shown in Figure 120
on page F-3. If they are not (as shown in Figure 121 on page F-3), this indicates that there is a
constant steady state roll offset in the mounting angles. Use the multibeam software to
compensate for this offset.
C
A
B
D
E
X
X
O
