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1. MOUNTING
1-2
1.1 Hull Unit
1.1.1 Mounting location
Discussion and agreement are required with the dockyard and ship owner in deciding the
location for the hull unit. When deciding the location, take into account the following points:
• Select an area where propeller noise, cruising noise, bubbles and interference from
turbulence are minimal. Generally, the point at 1/3 to 1/2 of the ship’s length from the bow or
near the keel is the best. On-the-keel installation is advantageous for minimizing oil
consumption in comparison with off-the-keel. If the hull unit cannot be installed on the keel,
the center of the retraction tank should be within 1 meter of the keep to prevent a rolling
effect.
1/2 1/3
Within 1 m
Installation location for hull unit
• Select a place where interference from the transducers of other sounding equipment is
minimal. The hull unit should be at least 2.5 meters away from the transducers of other
sounding equipment.
• An obstacle in the fore direction not only causes a shadow zone but also aerated water,
resulting in poor sonar performance. Be sure to locate the transducer well away from any
obstacle in the fore direction.
• The space shown in the illustration below is required around the hull unit for wiring and
maintenance. If the transducer is to be operated in ambient temperature below 0°C, the sonar
compartment must be provided with a heater to keep the temperature above 0°C.
BOW
direction
400800
400 800
45˚
Hull unit maintenance space