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Humminbird Wide 128 Operation Manual Page 6

Humminbird wide series fishfinder operation manual.
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Do not begin this transducer installation until you read the Installation
Preparation in the Operation Guide. This chapter contains information critical to
the correct installation of your transducer.
Due to the wide variety of boat hulls, only general instructions are presented in
the installation guide. Each boat hull represents a unique set of requirements that
should be evaluated prior to installation.
Step One - Determine Where to Mount the Transducer
Begin the transducer installation by determining where on the
transom to install the transducer. Consider the following to find
the best location:
It is very important to locate the transducer in an area which is
relatively free of turbulent water, As a boat moves through the
water, turbulence is generated by the weight of the boat, and
the thrust of the propeller(s). This turbulent water is normally
confined to areas immediately aft of ribs, strakes or rows of
rivets on the bottom of the boat, and in the immediate area of
the propeller(s) (Figure 1). On outboard or inboard/outboard
boats it is best to stay at least 15" (40cm) to the side of the
If possible, viewing the transom of the boat while the boat is
moving will provide the best means of locating turbulence free
water. If maximum high-speed operation is a high priority, this
is the recommended method. If this is not possible, select a
location on the transom where the hull forward of this location
is smooth, flat, and free of protrusions or ribs.
The transducer when mounted should point straight down.
The design of the transducer will accommodate a wide range
of deadrises and remain ported straight down (Figure 2).
On boats with stepped hulls, it may be possible to mount the transducer on the step.
Never mount the transducer on the transom behind a step, as this area of the
transom will not be in contact with the water at high speed (Figure 3).

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