Humminbird ONIX8 Installation Manual page 15

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Determine the Transducer Mounting Location
Decide where to install the transducer on the inside of the hull. Consider the following to find
the best location:
• Observe the outside of the boat hull to find the areas that are mostly free from turbulent
water. Avoid ribs, strakes, and other protrusions, as these create turbulence (see Areas
of Possible Turbulence).
• As a general rule, the faster the boat can travel, the further aft and closer to the centerline
of the hull the transducer has to be located in order to remain in contact with the water
at high speeds (see Preferred Mounting Area).
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| Trial Installation
You will not be able to adjust the mounting after an inside the hull transducer is installed. It is
best, therefore, to perform a trial installation first that includes running the boat at various
speeds, in order to determine the best mounting area before permanently mounting the
transducer.
1. Plug the transducer into the control head, then power up the control head. If the unit
does not power-up, confirm that the cable connectors are properly connected and that
power is available.
2. Setup Guide: See the section Setup Guide for initial start up instructions. You must
complete the steps indicated in the Setup Guide before starting normal operation.
NOTE: After completing the Setup Guide, the control head will automatically enter normal
operation.
3. Press the HOME key
4. Select a sonar view from the Favorites bar to display on-screen.
NOTE: See your control head operations manual for more information about selecting
views.
5. View the sonar signal at its best by holding the transducer over the side, immersed in the
water, so that it is pointing straight down over a known flat bottom. Use the display to
benchmark against the sonar signal that will be detected once the transducer is placed
in the hull.
6. Place the transducer body face down at the identified mounting location inside the hull,
with the pointed end towards the bow (see In-Hull Transducer Installation).
7. Fill the hull with enough water to submerge the transducer body. Use a sand-filled bag or
other heavy object to hold the transducer in position. The transducer cannot transmit
through air, and the water purges any air from between the transducer and the hull, and
fills any voids in the coarse fiberglass surface.
8. View the sonar signal on the display and compare against what was observed in Step 5,
making sure that the boat is in the same location as it was during your observations in
Step 5. If the results are comparable, move on to Step 9. Otherwise, locate a new position
in the hull and repeat Steps 6 through 8.
9. Run the boat at various speeds and water depths while observing the screen on the
control head. If depth performance is required, test the transducer in water at the desired
depth. If the performance is acceptable, move on to Step 10. If the performance is not
acceptable, repeat Steps 6 through 9.
10. Once you have determined the best mounting location using the above steps, mark the
position of the transducer.
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Areas of Possible Turbulence
rivets
strakes
hull
Preferred Mounting Area
In-Hull Transducer Installation -
200/83 kHz Transducer
In-Hull Transducer Installation -
200/50 kHz Transducer
Install the DualBeam PLUS Transducer
transom