Humminbird ONIX8 Installation Manual page 11

DualBeam PLUS Transducers
200/83 kHz 200/50 kHz
D B PLUS T
UAL EAM
1
|
Prepare the Mounting Location
In this procedure, you will determine the mounting location and drill two mounting holes,
using the transducer mounting bracket as a guide.
1. Confirm you have read the transducer mounting requirements under Transom
Transducer Mounting Requirements.
2. Make sure that the boat is level on the trailer, both from port to starboard and from
bow to stern, by placing your level on the deck of the boat, first in one direction, then in
the other.
3. Hold the mounting bracket against the transom of the boat in the location you have
selected. Align the bracket horizontally using the level. Make sure that the lower corner
of the bracket does not protrude past the bottom of the hull, and there is at least 1/4"
clearance between the bottom of the bracket and the bottom of the transom for
fiberglass boats, and 1/8" clearance for aluminum boats.
NOTE: If you have a flat-bottomed aluminum boat, some additional adjustment may be
needed to accommodate the rivets on the bottom of the boat (in other words, the gap
may need to be a little smaller than 1/8"). This will help you to avoid excessive turbulence
at high speeds.
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 align
the bottom right corner of the mounting bracket with the bottom of the boat. If your
propeller moves counterclockwise as the boat moves forward (as you're facing the stern
of the boat from behind), mount the transducer on the port side, and align the bottom
left corner of the mounting bracket with the bottom of the boat.
4. Continue to hold the bracket on the transom of the boat, and use a pencil or marker to
mark where to drill the two mounting holes. Mark the drill holes near the top of each slot,
making sure that your mark is centered in the slot, as shown in the illustration.
NOTE: The third hole should not be drilled until the angle and height of the transducer is
finalized, which you will not do until a later procedure.
5. Make sure that the drill bit is perpendicular to the actual surface of the transom, NOT
parallel to the ground, before you drill. Using a 5/32" bit, drill the two 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.
I
NSTALL THE
Use the procedures in the following sections to install the DualBeam PLUS transducer on
your boat. Your installation choices are as follows:
• Transom Mount
• Inside the Hull Mount
NOTE: Your transducer might not look exactly like the illustrations in this guide, but it will
mount in the same way.
M I
RANSOM OUNT
D B PLUS T
UAL EAM
NSTALLATION
7
RANSDUCER
Positioning the Mounting Bracket
Level
Boat Hull Types Require
Different Mounting Positions
1/8" for aluminum
1/4" for fiberglass
Using the Mounting Bracket
to Mark the Initial Drill Holes
mark initial drill holes
Install the DualBeam PLUS Transducer