top of the mounting bracket (Figure 7). Using needle-nose
pliers, break out the tabs on the rear of the mounting base
(Figure 8). Place the Hole Cover over the mounting surface
hole, then use it to mark the position of the two mounting
screws. Remove the Hole Cover, drill the two mounting holes
⁹⁄₆₄
using a
" (3.5 mm) bit, fill them with marine-grade silicone,
Break-out
tabs
then replace the Hole Cover and insert the #8 Phillips
Figure 8
countersink wood screws. Hand-tighten only.
Connector Holder
2. Place the mounting bracket on the mounting surface aligned
Transducer
Accessory
with the drilled holes and fill the mounting holes with marine
grade silicone. Insert the four #8 Phillips countersink wood
Communications
Power
screws into the mounting holes. Hand-tighten only.
5.
Assembling the Connector Holder
1.
Insert both the power and the transducer cable plugs into the
connector holder. The cable plugs are labeled, and there are
Figure 9
corresponding labels on the connector holder (Figure 9). The
slots for the plugs are keyed to prevent reverse installation,
and insertion should be easy - do not force plugs.
Connector Holder
2. Carefully pull the excess cable from beneath the mounting
Cable Connector
surface so that the connector holder aligns with the mounting
holes on the front of the mounting bracket (Figure 10).
3. Snap the support plate onto the rear of the connector holder
(Figure 11).
4. Insert the connector holder into place and fasten it to the
³⁄₄
Figure 10
mounting bracket using the two #6-32 x
" (19 mm) screws
(Figure 12). Hand-tighten only.
5. Slide the control head onto the mounting bracket until it is
Support Plate
fully seated. To remove the unit, grasp the unit with both
hands, then firmly press the latch on the rear of the unit and
lift (Figure 13).
NOTE: This latch is heavy-duty to withstand marine use, and
significant force must be applied.
Figure 11
You are now ready to install the transducer. Find the section that
refers to your transducer type.
TRANSOM TRANSDUCER
INSTALLATION
1.
Figure 12
Determine Transducer Mounting Location
NOTE: If transom mounting is not possible because of a
stepped hull or cavitation noise, and you have a single layer
fiberglass hull, In-hull installation is an option. See Inside the
Hull Transducer Installation for more information.
1.
First, determine the best location on the transom to install the
transducer. Consider the following to find the best location:
Firmly Press Latch
• It is very important to locate the transducer in an area which is
to Remove Unit
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) - either clockwise or counter-clockwise.
This turbulent water is normally confined to areas immediately
Figure 13
aft of ribs, strakes or rows of rivets on the bottom of the boat, and
in the immediate area of the propeller(s) (Figure 14). Clockwise
Stepped
propellers create more turbulence on the port side. On outboard
Aluminum
Fiberglass
Hull
or inboard/outboard boats, it is best to locate the transducer at
Hull
least 15" (380 mm) to the side of the propeller(s).
• The best way to locate turbulence-free water is to view the transom
Step
while the boat is moving. This method is recommended if
Rivets
and Strakes
maximum high-speed operation is a high priority. If this is not
Turbulence
possible, select a location on the transom where the hull forward of
Figure 14
this location is smooth, flat and free of protrusions or ribs.
• The hydrodynamic shape of your transducer allows it to point
straight down without deadrise adjustment (Figure 15) as long
as the deadrise does not exceed 15 degrees. If the deadrise is
greater than about 15 degrees it will be necessary to angle the
transducer slightly. While this does not significantly degrade
performance, you must keep in mind that the area you are
viewing on the control head screen may be somewhat to one
side of the boat, not directly in the center.
Figure 15
• On boats with stepped hulls, it may be possible to mount the
Step
transducer on the step. Do not mount the transducer on
the transom behind a step to avoid popping the transducer
out of the water at higher speeds; the transducer must
remain in the water for the control head to maintain the
sonar signal (Figure 16).
• If the transom is behind the propeller(s), it may be impossible
Figure 16
to find an area clear from turbulence, and a different
mounting technique or transducer type should be considered
(see Inside the Hull Transducer Installation).
2.
Mounting the Bracket
1.
Remove the transducer mounting template from this sheet.
2. Hold the template on the transom of the boat in the location
where the transducer will be installed. Align the template
vertically, making sure that the lower edge of the transom on
either side of the template falls within the horizontal lines on
the template. If not, tilt the template slightly so that the lower
edge of the transom on both sides of the template falls within
the allowable range. (Figure 17)
3. Using a pencil or punch, mark the three mounting holes on the
transom. Do not mark or drill any other holes at this time.
⁵⁄₃₂
4. Using a
" (4.0 mm) bit, drill the three holes to a depth of
approximately 1" (25 mm). On fiberglass hulls, it is best to use
progressively larger drill bits to reduce the chance of chipping
or flaking the outer coating. Use a marine-grade silicone
sealant to fill the drilled holes.
5. Align the metal mounting bracket with the mounting holes.
The center slot should be above the two outer slots. (This
bracket and all other hardware supplied is top quality
stainless steel for maximum strength and corrosion
protection.) Insert the three 1” (25 mm) flat head wood
screws into the drilled holes, but do not completely tighten.
(Figure 17)