Summary and general recommendations
Some of the installation guidelines provided may be conflicting. Each vessel must be treated individually in order to find the best compromise.
In general, the most important factor is to avoid air bubbles in front of the transducer face. For this reason, the recommended transducer location is normally in the fore part of the hull, well ahead of the noise created by the bow wave. The maximum distance from the bow is normally equal to one third of the total water line length of the hull.
Typical recommended location
C. Hull length at water line
D. Maximum 1/3 of the hull length at water line (C)
If the vessel hull has a bulbous bow, this may well be a good transducer location, but also in this case the flow pattern of the aerated water must be taken into consideration. Often the foremost part of the bulb is preferable.
Typical location on a bulbous bow
B. Transducer location
This applies to the vessel in normal trim and speed. Under no circumstances should the transducer be tilted backwards when the vessel is moving at an appreciable speed. Mounting screws must never be extruding from the transducer, and the space around the screws must be filled with a compound or a locking ring.