Due to the wide variety of boat hulls, only general instructions are presented in the installation guide. Each boat hull represents a unique set of requirements that should be evaluated prior to installation.
Step One - Determine Where to Mount the Transducer
1. Begin the transducer installation by determining where on the transom to install the transducer. Consider the following to find the best location:
2. It is very important to locate the transducer in an area which is 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). This turbulent water is normally confined to areas immediately aft of ribs, strakes or rows of rivets on the bottom of the boat, and in the immediate area of the propeller(s). On outboard or inboard/outboard boats it is best to stay at least 15" (40cm) to the side of the propeller(s)
3. If possible, viewing the transom of the boat while the boat is moving will provide the best means of locating turbulence free water. If maximum high-speed operation is a high priority, this is the recommended method. If this is not possible, select a location on the transom where the hull forward of this location is smooth, flat, and free of protrusions or ribs
4. The transducer when mounted should point straight down. The design of the transducer will accommodate a wide range of deadrises and remain ported straight down
5. On boats with stepped hulls, it may be possible to mount the transducer on the step. Never mount the transducer on the transom behind a step, as this area of the transom will not be in contact with the water at high speed
6. If the propeller(s) is (are) forward of the transom, it may be impossible to find an area clear from turbulence, and a different mounting technique or transducer type should be considered.
Step Two - Drill the Mounting Holes
1. Determine if your fish finder comes with a mounting template.
2. Hold the template on the transom of the boat in the location where the transducer will be installed. Align the template vertically, ensuring the lower edge of the transom meets with the bottom corner of the template.
3. Using a pencil or punch, mark the mounting holes shown on the template onto the transom. Using the recommended bit, drill the holes to the desired. On fiberglass hulls, it is best to start with a smaller bit and use progressively larger drill bits to reduce the chance of chipping or flaking the outer coating.
Step Three - Assemble and Mount the Transducer to the Transom
1. Apply silicone sealant to the mounting holes drilled into the transom.
2. Align the transducer assembly with the drilled holes in the transom.
3. Mount the transducer assembly to the transom as shown. Do not fully tighten the mounting screws in order to vertically adjust the transducer. Snap the pivot down into place.
Step Four - Adjust the Running Position of the Transducer
The brackets usually allow height and tilt adjustment, the pivot screws allow angular adjustment. Initially, adjust the transducer as described in the following paragraphs. Further adjustment may be necessary to refine the instillation after high speed testing.
1. First adjust the pivot angle of the transducer body so its length is parallel with the length of hull of the boat. Then pivot the transducer down so the rear is about 1/4 inch (6mm) lower than the front.
2. Fully tighten the screws. It may be necessary to retighten the pivot screws after the initial use as the plastics may still be seating to the lock washers.
3. Adjust the height of the assembly so the face of the transducer is 3/16" (4.5mm) beneath the lower edge of the transom. And tighten remaining screws.
Step Five - Route the Cable
There are several ways to route the transducer cable to the area where the control head will be installed. The most common procedure routes the cable through the transom into the boat. Inside the boat there is often a channel or conduit used for other wiring that the cable can be routed along. Do not cut or shorten the transducer cable and try not to damage the cable insulation. Route the cable as far as practical from the VHF radio antenna cables or tachometer cable to reduce the possibility of interference. If the cable is too short, many manufacturers offer extension cables.
Follow these steps to route the cable through the transom:
1. Drill a hole above the water line. Route the cable through the hole.
2. Fill the hole with silicone sealant.
3. Place an escutcheon plate over the hole and attach with screws.
Note: Allow enough slack in the cable for pivot movement.