Kongsberg Simrad SN90, Installation Manual

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Note
If you only use a sealing plate to bring the transducer cables through the hull, the
compartment directly over the sealing plate must be watertight. Make sure that your
arrangement is approved by the relevant national registry and corresponding maritime
authority and/or classification society.
Installation drawings
The installation shipyard must provide all necessary design and installation drawings, as
well as the relevant work standards and mounting procedures.
If required, all documents provided by the shipyard for the physical installation of the
SN90 must be approved by the vessel’s national registry and corresponding maritime
authority and/or classification society. Such approval must be obtained before the
installation can begin. The shipowner and shipyard doing the installation are responsible
for obtaining and paying for such approval.
Installing the transducer for navigational use
When the SN90 is put to use as a navigational instrument, the physical installation of the
transducer is made by designing a blister or keel box. You can also install the transducer
in the bow of the vessel.
For navigational use, the transducer must be installed facing forward. A blister or keel
box must be designed by the installation shipyard to fit the vessel’s hull. The same blister
or hull box may also be used for other sonar and echo sounder transducers.
The distance from the bow must be determined by the vessel's physical properties, and
the desired coverage area. You must also consider the noise factors.
Installing the transducer