Inside the hull installation requires the mount system and control head be installed and operational. Inside the hull mounting generally produces good results in single thickness fiberglass-hulled boats. Keep in mind, some signal loss occurs. The amount of loss depends on hull construction and thickness, and the installation. This installation typically requires slow-cure two-part epoxy. Do not use silicone or any other soft adhesive to install the transducer, as this material reduces the sensitivity of the unit. Five minute epoxy has a tendency to cure before all the air bubbles can be purged.
Step One - Determine the Mounting Location
Begin the transducer installation by determining where inside the hull to install the transducer. 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. 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 to remain in contact with the water at high speeds.
Step Two - Test the Mounting Location
There is no opportunity for adjustment after the transducer glued in place. Therefore, it is best to perform a trial installation on inside the hull transducers first, and run the boat at high speeds to determine the best mounting area.
1. At the identified mounting location, lay the transducer body face down with the pointed end towards the bow.
2. Add water to the area, enough to keep the bottom of the transducer in water while moving. The transducer cannot transmit through air. The water purges any air from between the transducer and the hull and fills any voids in the coarse fiberglass surface.
3. Power up the Control Head.
4. Run the boat at various speeds and water depths while observing the screen on the Control Head. If the unit functions well at low speeds but begins to skip or miss the bottom at higher speeds, the transducer needs to be moved. If depth performance is required, test the fish finder in water at the desired depth. Test different locations in the hull until the optimum performance is achieved.
Step Three - Permanently Mount the Transducer
1. Once the mounting location is determined, mark the position of the transducer.
2. Remove the water from inside the hull and thoroughly dry the mounting surface. If the surface is excessively rough, it may be necessary to sand the area to provide a smooth mounting surface. Ensure the mounting area is clear and dry.
3. Mix an ample quantity of two-part slow-cure epoxy slowly and thoroughly. Avoid trapping air bubbles.
4. Coat the face of the transducer and the inside of the hull.