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4. INSTALLATION
4.1 Display Unit
Mounting considerations
The display unit can be installed on a
desktop, on the bulkhead or flush
mounted in a panel. When choosing a
location keep the following in mind:
• Keep the display unit out of direct
sunlight.
• The temperature and humidity should
be moderate and stable.
• Locate the unit away from exhaust
pipes and vents.
• The mounting location should be well
ventilated.
• Mount the unit where shock and
vibration are minimal.
• For maintenance and checking
purposes, leave sufficient space at
the sides and rear of the unit and
leave slack in cables.
• A magnetic compass will be affected if
the display unit is placed too close to
it. Observe the following compass
safe distances to prevent disturbance
to the magnetic compass:
Standard compass: 0.4 meters
Steering compass: 0.3 meters
Desktop, overhead mounting
1. Fix the bracket to a desktop or the
overhead with tapping screws
(supplied).
2. Loosely screw knobs into the display
unit.
3. Set the display unit to the bracket
and then tighten the knobs.
Mounting on the bulkhead, Flush
mounting in a panel
See the instructions on the bulkhead or
flush mounting template (supplied).
4.2 Thru-hull Mount
Transducer
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 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