Raymarine 465 - Manual (Page 15)

4 Installation
2 – Installation
The installation process has four parts:
• Mounting the transducer
• Mounting the display unit
• Connecting the cables for the transducer and power supply
• Calibrating the display unit
About the Transducer
Several different kinds of transducers can be used with this unit. The
transom-mount type is used most often. Other types are shown in Fig. 2-
1.
Most transducer types can measure the water depth. Some of the
transducers also have two other sensors: a paddle wheel which detects
the speed of the boat, and a sensor for the water temperature. The
display unit uses the speed information to calculate the distance the boat
has traveled.
The transducer is very important to the operation of the FishFinder. It is
also important that you mount the transducer correctly. The transducer
will give the most reliable readings if it looks into water which is smooth
and undisturbed. If you place the transducer so bubbles or turbulence
flow across the face of the unit, the system may give inaccurate readings.
There are three important rules for placing any type of transducer:
• The transducer should be continuously covered by water when the
boat is moving. (If the transducer is mounted near the side of the
boat, it may be exposed when the boat is turning.)
• The transducer should be placed where turbulence or bubbles will
not pass directly over the face of the unit. Don’t place the transducer
behind any running strakes, intakes, or thru-hull fittings which create
turbulence.
• The transducer should be mounted where it will not be affected by
the wash from the propeller(s).