Transducer 520-5Psd, 520-5Msd; Mounting Location - Furuno BBDS1 Operator's Manual

1.2

Transducer 520-5PSD, 520-5MSD

1.2.1

Mounting location

The performance of this sounder is directly related to the mounting location of the transducer, es-
pecially for high-speed cruising. The installation should be planned in advance, keeping the stan-
dard cable length and the following factors in mind:
• When the boat has a keel, the transducer should be at least 15-30 cm (5.9" - 11.8") away from
it. Typical thru-hull mountings are shown in the figure on the next page.
• 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 al-
ways in water regardless of the planing attitude
120 mm (4.7")
30 mm (1.2")
22 mm (0.9")
68 mm (2.7")
520-5PSD
24 mm (0.9")
120 mm (4.7")
28 mm (1.1")
68 mm (2.7")
87 mm (3.4")
520-5MSD
2
1. MOUNTING
Ship's bow