Figure 128: Vessel Horizontal and Vertical reference system
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 a tape and plumb-bob, which is detailed below.
10.3.1 Sonic 2024 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 129: Sonic 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
Page 128 of 210
Version 5.0 Rev r002
Date 05-08-2014
Part No. 96000001
To Next Page
Loading...
Need help?
General
