Kongsberg Simrad ES80, Installation Manual, Page: 48 / 312

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Where to install the transducer
A single answer to the question "where to install the transducer" cannot be given.
The physical location of the transducer depends on the vessel's design and construction, how
the hull is shaped, and how the water runs along the hull. There are however a number of
important guidelines, and some of these are even conflicting.
Note
The information here must be considered as general advice. Each ES80 installation must be
handled separately depending on the hull design and the other electrical and mechanical
systems installed on the vessel.
Topics
Mount the transducer deep, page 46
Avoid protruding objects near the transducer, page 47
Mount the transducer at forward part of hull to minimize the effects from the flow boundary
water layer, page 48
Keep the transducer far away from the propellers, page 49
Mount the transducer at a safe distance from bow thruster(s), page 49
Summary and general recommendations, page 51
Mount the transducer deep
In order to achieve the best possible ES80 performance, mount the transducer as deep as
possible under the vessel’s hull.
There are several reasons for this recommendation.
Flow noise
Consider the situations when the vessel is unloaded, and pitching in heavy seas. The vessel
is riding high, and the bow may even be lifted out of the water. This will cause a lot of
air to follow the shape of the hull.
The upper water layers of the sea contain a myriad of small air bubbles created by the
breaking waves. In heavy seas the upper 5 to 10 metres may be filled with air, and the
highest concentrations will be near the surface. Air bubbles absorb and reflect the sound
energy, and they may in worst cases block the sound transmission altogether.
Simrad ES80 Installation Manual