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1.2 Thru-hull Mount Transducer 520-5PSD, 520-5MSD
Transducer mounting location
This type of mounting 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 this sounder is directly related to the mounting location of the
transducer, especially 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.
Transducer outline drawings
22
24
120
120
68
68
87
30
28
520-5PSD
520-5MSD
All dimensions
in millimeters
Ship's
bow
Figure 1-2 Dimensions of transducers 520-5PSD, 520-5MSD