Furuno GP-7000F installation manual Thru-hull mounting, Transducer mounting location

Thru-hull mounting

Transducer mounting location

The thru-hull mount transducer (520-5PSD, 520-5MSD) provides the best performance of all, since the transducer protrudes from the hull and the effect of air bubbles and turbulence near the hull skin is reduced. When the boat has a keel, the transducer should be at least 30 cm away from it. Typical thru-hull mountings are shown in the figure on the next page.

The performance of a sounder is directly related to the mounting location of the transducer, espe- cially for high-speed cruising. The installation should be planned in advance, keeping the standard cable length (8 m) and the following factors in mind:

•Air bubbles and turbulence caused by movement of the boat seriously degrade the sounding capability of the transducer. The transducer should, therefore, be located in a position where water flow is the smoothest. Noise from the propellers also adversely affects performance and the transducer should not be mounted nearby. The lifting strakes are notorious for creating acoustic noise, and these must be avoided by keeping the transducer inboard of them.

•The transducer must always remain submerged, even when the boat is rolling, pitching or up on a plane at high speed.

•A practical choice would be somewhere between 1/3 and 1/2 of the boat's length from the stern. For planing hulls, a practical location is generally rather far astern, so that the transducer is always in water regardless of the planing attitude.

2224

120120

30 28

68

68	90	Unit: mm
520-5PSD	520-5MSD

Thru-hull mount transducer mounting dimensions (millimeters)

7