Kongsberg EM 2040 MKII, Installation Manual

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Externally mounted with fairings
The transducer arrays can be mounted directly under the vessel’s hull.
A fairing will usually be added around the transducers to ensure laminar water flow
without any aeration problems.
Installation with fairings has proven successful in former multibeam echo sounder
installations.
Note
The installation shipyard must provide all necessary installation drawings.
If required, all drawings and documents 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.
Preparing the installation