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Version 3.0 Rev r000
Date 25-08-2010
Part No. 96000001
3.2
Sonar Head Installation Guidelines
3.2.1
Introduction
The proper installation of the Sonic 2024/2022 sonar head is critical to the quality of data that will
be realised from the system. No matter the type of installation (hull mount, moon pool, or over-the-
side pole), the head must be in an area of laminar flow over the array. Any vibration or movement
of the sonar head, independent of vessel motion, will result in reduced swath coverage and noise in
the data. To this end, the head must be installed on as sturdy a mounting arrangement as possible;
fore and aft guys are NOT recommended as a means to obtain this stability.
The initial investigation of where to mount the sonar head should take into account any engines,
pumps, or other mechanical equipment that may not be operating at the time, but may be a cause
of vibration or noise when operating under normal survey conditions.
The structural stability of any decks, bulkheads, or superstructure, which will be employed when
mounting the sonar head, must be taken into account and strengthened if necessary.
3.2.2
Over-the-Side mount
The over-the-side mount is normally employed for shallow water survey vessels and/or temporary
survey requirements. The over-the-side mount consists of a frame structure that is attached to the
vessel’s hull or superstructure. A pole will be attached to the frame, normally through the use of
swivel flanges, flanges, or other means by which the head can be swung up when not in use and
deployed when needed. A similar mounting arrangement is the bow – mount, which is specialised
form of an over-the-side mount.
In order to ensure stability of the pole, it should have a securing arrangement as close to the water
line as possible. As stated above, the use of fore or aft guy wires
is strongly discouraged.
When the pole is in the ‘up’ position it should be secured so that
there is no or little movement that would be a strain on the
flanges or mount. The head should be washed with fresh water
as soon as possible and inspected for any damage or marine
growth. If the head is to remain in the ‘up’ position; a covering
should be put over the head that will protect it from the sun.
Figure 19: Typical over-the-side mount
Summary of Contents for 2022
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