9
4) DO NOT locate the transducer in the extreme bow of the
boat where it will be subject to intense turbulence as the boat
pounds through the water.
5) DO NOT locate the transducer directly behind any hull
protrusion which will cause the water to be turbulent when it
reaches the transducer or which will obstruct the transducer’s
forward looking view.
DANGER: DO NOT allow any solvents, i.e. gasoline,
acetone, to come in contact with the transducer or head unit
as this may dissolve the plastic material.
DO NOT force the cable by pulling on it. This may sever
the internal transducer wiring.
The Transducers
The two iScan 180 transducers are designed to be mounted
on opposite sides of the vessel’s keel. Although similar in
appearance, the two transducers operate differently and it is
important that they be mounted on the proper side of the
vessel’s keel. Mount the Port-Side transducer on the port
side of the keel (the left side of the hull, looking forward
from the stern), and mount the Starboard-Side transducer
on the starboard side of the keel (the right side of the hull,
looking forward from the stern).
The Port and Starboard transducers can be identified, as
shown in the diagram at right, by the fact that the Starboard-
side transducer is slightly larger and has two cables
compared to the Port-side transducer’s single cable. In
addition, each cable has a small label approx. 6” from the
connector which identifies it as the PORT HORZ, STBD
HORZ or STBD VERT. (Horz stands for Horizontal
direction and Vert stands for vertical direction.)
Forward Direction
The orientation of the mounted transducers is critical to the
performance of the iScan 180. Note that the more blunt,
rounded end of each transducer should be pointed forward.
The angled, more narrow ends should be pointed aft as
shown in the figure at the upper right.
Selecting the Best Location
The best location to mount the thru-hull transducer will vary
with the type of boat. In order to simplify the installation,
attempt to find a location with a small dead-rise angle.
Note: For best performance the transducers should be
mounted 18” - 24” apart.
Typical Thru-Hull Transducer Locations
Full Keel Sailboat
Displacement Power
Vessel Hull
L = Length of Waterline
~ 1/4 to 1/3 L
L = Length of Waterline
~ 1/4 to 1/3 L
Transducer
Transducers
Port Side Transducer
with ONE 30’cable
Starboard Transducer
With TWO 30’ cables
FORWARD FORWARD
Fairing Block Fairing Block
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