Humminbird ONIX8 Installation Manual page 18

Deadrise
• In order for the side beams to be displayed accurately, the transducer must be mounted
parallel with the waterline. This positioning allows the beam elements to point straight
down without deadrise adjustment (see the illustration Deadrise).
NOTE: Rough seas, high speed, and air bubbles can also affect the reading of the Side
Imaging transducer.
1
|
Mount the Transducer Bracket
In this procedure you will mount the bracket, using the mounting template provided as a
guide. This template allows you to mark where the mounting holes should be drilled. See
Side Imaging Transducer Mounting Template at the end of this manual.
1. Confirm you have read the transducer mounting requirements under Transom
Transducer Mounting Requirements and Side Imaging Transducer Mounting
Requirements.
2. Cut out the transducer mounting template from the back of this manual (see Side
Imaging Transducer Mounting Template). Match the mounting bracket screw slots to
the template screw slots.
3. Hold the template on the transom of the boat in the location you have selected. Align
the template vertically, matching the lower edge of the transom with the bottom corner
of the template.
NOTE: If your propeller moves clockwise as the boat moves forward (as you're facing
the stern of the boat from behind), mount the transducer on the starboard side, and
use the bottom left corner of the template. If your propeller moves counter-clockwise
as the boat moves forward (as you're facing the stern of the boat from behind), mount
the transducer on the port side, and use the bottom right corner of the template.
4. Continue to hold the template on the transom of the boat, and use a pencil or punch
to mark where to drill the three mounting holes shown on the template.
5. Using a 5/32" bit, drill the three holes only to a depth of approximately 1".
NOTE: On fiberglass hulls, it is best to use progressively larger drill bits to reduce the
chance of chipping or flaking the outer coating.
6. Use a marine-grade silicone sealant to fill the drilled holes, especially if the holes
penetrated the transom wall.
7. Align the metal mounting bracket with the mounting holes. The center slot of your
mounting bracket should be above the two outer slots. Insert the three 1" flat head
wood screws into the drilled holes, but do not completely tighten.
NOTE: The mounting bracket and all other hardware supplied is top quality stainless
steel for maximum strength and corrosion protection.
2
| Assemble the Transducer
In this procedure you will attach the pivot to the transducer using the hardware provided.
1. Attach the pivot to the transducer body as shown in the illustrations using the square
nuts, toothed washers, and two 1/4–20 x 5/8" machine screws. The square nuts will be
prevented from rotating by the pocket in the back of the pivot. The toothed washers
must fit on the inside of the transducer ears, between the pivot and the ears.
NOTE: An Allen wrench is provided which fits all of the 1/4–20 screws, but do not fully
tighten the screws at this time.
Install the Side Imaging Transducer 14
Deadrise
deadrise angle
Attaching the Bracket
Inserting the Square Nuts
square
nuts
Attaching the Pivot
toothed
washer
transducer
ear
pivot
machine
screw