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1. HOW TO INSTALL THE SYSTEM
1.1 Hull Unit
Note 1: The control box on the hull unit contains a motion sensor. Handle the hull unit
carefully.
Note 2: Handle the transducer carefully. Rough handling will damage its sensitive
components.
1.1.1 Installation considerations
Decide the location of the hull unit through consultation with the dockyard and ship
owner. When deciding the location, the following points should be taken into account.
• Select an area where propeller noise, cruising noise, air 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. If the
hull unit can not be installed on the keel, the center of the retraction tank should be
within 600 mm from the keel to prevent a rolling effect. For large ship with deep
draft, the hull unit can be installed at the bow.
• Select a place where the hull bottom is flat and the draft is sufficiently deep. Normal-
ly, the transducer should protrude at least 500 mm beyond the keel to minimize the
effect of air foam and bubbles.
• Select a place where interference from other transducers is minimal. The hull unit
should be at least 2.5 m away from the transducers of other equipment.
• No obstacle should be in the fore direction since it causes a shadow zone and aer-
ated water, resulting in poor sonar performance.
• The physical distance between the hull unit and the transceiver unit should be no
more than 5 m.
• The space shown in the figure on the next page is required around the hull unit for
wiring and maintenance.
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Within 600 mm