Page 10 of 68
Doc. P/N: WSP-009-002
Version: V2.3
Issue Date: July 2014
Installation Manual
www.wassp.com
Mounting
Mounting Considerations
Mounting the Transducer – General Considerations
The transducer is mounted on the hull below the water line, normally using a
permanent sea chest. The transducer must be mounted so that it is aligned with the
fore-aft axis of the vessel. It must also be mounted so that the flat underside of the
transducer is as close to horizontal as possible.
If the vessel has a keel, the transducer can be mounted somewhere along the
length of it. If it is mounted on the hull, it should be far enough away from the keel
so that the keel will not be detected within the 120° beam angle. Figure 3 shows a
sea chest type through-hull mounting designed specifically for a fast moving, alloy
hull crayfish boat.
The performance of the system is directly related to the mounting location of the
transducer, especially for high-speed cruising. The installation should be planned in
advance, keeping in mind the fixed cable length of 10 meters and the following factors:
►
Air bubbles and turbulence caused by movement of the vessel seriously
degrade the sounding capability of the transducer. The transducer should be
located in a position with the most smooth water flow.
►
The transducer should not be mounted close to propellers because noise from
propellers can adversely affect the performance of the transducer.
►
Mount the transducer inboard of lifting strakes as these create acoustic noise.
►
The transducer must always remain submerged, even when the boat is rolling,
pitching or planing at high speed.
►
A practical choice would be somewhere between a ⅓ and a ½ of the boat’s
length from the stern. For planing hulls, a practical location is generally towards
the rear of the vessel, to ensure that the transducer is always submerged,
regardless of the planing angle.
►
Do not mount another transducer near the WASSP transducer as it will interfere
with the 120° beam.
Mounting Considerations for the Personal Computer
The WASSP Ltd. supplied Shuttle XPC computer must be mounted on a flat, stable
surface. The computer can be mounted horizontally using the supplied stand. Keep
the following in mind when selecting a mounting location for the computer:
►
Secure the computer so that it cannot come loose in rough seas.
►
Keep the computer out of direct sunlight.
►
The temperature and humidity of the location where the computer is mounted
should be moderate and stable.
►
Locate the computer away from exhaust pipes and vents.
►
The mounting location should be well ventilated.
►
Mount the computer where shock and vibration are minimal.
►
Keep the computer away from electromagnetic field-generating equipment,
such as motors or generators.
►
For maintenance and checking purposes, leave sufficient space at the sides
and rear of the computer installation location.
►
A magnetic compass will be affected if placed too close to the computer. Do
not locate the computer closer than the following compass safe distances to
prevent interference with the magnetic compass:
• Standard compass: 0.8 meters.
• Steering compass: 0.6 meters.
