Furuno CSH-5LMARK-2, Installation Manual

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1. MOUNTING
1-2
1.1 Hull Unit
1.1.1 Installation position of hull unit
Discussion and agreement are required with the dockyard and the ship owner in de-
ciding the installation position of the hull unit. When deciding the installation position,
the following points should be taken into account.
1) Select an area where propeller noise, cruising noise, bubbles and interference
from turbulence are at a minimum. Generally, the point at 1/3 to 1/2 of the ship’s
length from the bow on or near the keel is optimum. On-the-keel installation is ad-
vantageous for minimizing oil consumption in comparison with off-the-keel. In case
the hull unit cannot be installed on the keel, the center of the retraction tank should
be within 1 m of the keel so as to prevent a rolling effect.
Installation position of hull unit
2) Select a place where interference from other equipment is minimal. The hull unit
should be at least 2.5 m away from the transducers of other equipment.
3) An obstacle in the fore direction not only causes shadow zone but also aerated wa-
ter, resulting in poor sonar performance.
4) The following space is required around the hull unit for wiring and maintenance. If
the ambient temperature of the unit is below 0°C, the sonar compartment must be
provided with a heater so as to keep the temperature above 0°C.
Sonar room
1/2 1/3 Within 1 m
BOW
400 800
400
800
45˚