Page
160
of
254
Version
6.3
Rev
r012
Date
05-11-2022
Part No. 96000001
10.3
Measuring Offsets
The accurate measurement of offsets is vital to the accuracy of the survey data. If possible, the
vessel will be put on a hard stand so that it can be very accurately measured using standard land
survey equipment, such as a total station. However, this may not be possible, and the offsets will
have to be measured using tape and plumb-bob, which is detailed below.
10.3.1
Sonic MBES Acoustic Centre
Please refer to the drawings appendix to obtain measurements, with reference to the system
offsets, when mounting on the Sonic mounting frame.
Figure 176: Sonic 2026/2024/2022 Acoustic Centre
10.3.2
Horizontal Measurement
All measurements should be made with a metal tape measure. A cloth tape can stretch, it can also
be knotted or kinked, unknown to the persons making the measurements. At a minimum, two
people should be assigned to take the measurements; three people will work better with the third
person writing down the measurements. One person will be the holder, and the other will be the
reader. Starting at either the reference point or the sensor, the distance will be measured. When
Alongship ref
Athwartship
ref
Z
Reference
FORE
AFT
SONIC 2024 Side View
SONIC 2024 Plan View
120mm
39
m
m
18
7m
m
24
0m
m
Connector under
35mm
standoffs
Acoustic Centre
Alongship ref
Athwartship
ref
Z
Reference
FORE
AFT
SONIC 2022 Side View
SONIC 2022 Plan View
120mm
39
m
m
18
7m
m
13
8m
m
Connector under
35mm
standoffs
Acoustic Centre
Alongship ref
Athwartship
ref
Z
Reference
FORE
AFT
SONIC 2026 Side View
SONIC 2026 Plan View
18
7m
m
24
0m
m
Connector under
240mm
Acoustic Centre
Summary of Contents for 2026
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Page 158: ...Figure 174 Smooth log information copied from a real time survey log...
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Page 237: ...Page 237 of 254 Version 6 3 Rev r012 Date 05 11 2022 Figure 215 Sonic 2026 Projector...
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Page 249: ...Page 249 of 254 Version 6 3 Rev r012 Date 05 11 2022 Figure 227 Locking Ring type Deck Lead...
Page 251: ...Page 251 of 254 Version 6 3 Rev r012 Date 05 11 2022 Figure 229 I2NS Type 82 IMU offsets...
Page 253: ...Page 253 of 254 Version 6 3 Rev r012 Date 05 11 2022 Figure 231 I2NS SIM Dimensions...