Installing A Fishfinder: Aluminum Boat Guide

Fish finders are a great way to increase your success as an angler. While modern fish finders offer a lot of user-friendly features, the hardest part is the installation. In this article, we will discuss how to install a fish finder on an aluminum boat.

There are three main components of a fish finder: the display, transducer, and battery. The transducer sends a signal through the water, which bounces back when it hits a fish, structure, or the bottom. This return signal is then transferred to the display unit, which interprets it into images on the screen.

When installing a fish finder on an aluminum boat, there are a few things to keep in mind. First, it is important to use a plastic transducer mount to avoid potential electrolysis problems. Second, the chosen location for the transducer should not interfere with the boat's trailer, and it should be at least one foot away from the engine's lower unit.

One option for mounting the transducer is to use a transom mounting plate, which only requires drilling two holes and allows for future adjustments. Another option is to use a nylon plate to mount the transducer to the transom, sealing the mounting holes to prevent leakage.

For those who want to avoid drilling holes in their boat, an alternative method is to create a mounting bracket out of plywood and attach it to the boat using an oarlock. The transducer can then be mounted on a plywood bracket and the cord can be run over the top of the transom.

By following these tips and instructions, you can successfully install a fish finder on your aluminum boat and start harnessing the power of modern electronics to improve your fishing experience.

Choosing the right transducer mount

When choosing a transducer mount for your fish finder, there are several factors to consider. The type of boat you have, the size of your boat, and your personal preferences will all play a role in determining the best transducer mount for your needs.

One popular option is to use a transom mounting plate. This option only requires drilling two holes in your boat and allows for future adjustments without drilling additional holes. Another benefit of using a transom mounting plate is that it provides a sturdy base for your transducer, reducing the risk of damage.

If you prefer not to drill holes in your boat, there are alternative mounting options available. One option is to purchase or cut a transducer board made from materials such as PVC, polyethylene, or plywood. You can then attach this board to your transom using marine epoxy or silicone adhesive. This method creates a secure base for your transducer without the need for drilling.

For those with aluminium boats, it is important to consider the type of transducer housing that will be compatible with your boat's hull. Stainless steel transducers, for example, are recommended for aluminium hulls and are also compatible with other hull materials. However, it is crucial to follow special installation procedures and use isolation sleeves or gaskets to prevent contact between the stainless steel and the aluminium hull, as this can lead to electrolytic corrosion.

When deciding on a transducer mount, it is also essential to consider the location of your transducer in relation to the water level. Follow the manufacturer's instructions to ensure the transducer is aligned correctly for the clearest signal.

Additionally, the type of sonar technology you plan to use may influence your choice of transducer mount. For example, a through-hull transducer is recommended for centre console boats to achieve the best sonar image. This type of transducer is installed under the boat, allowing for an uninhibited signal and return due to its position ahead of the motor and away from turbulence.

In summary, when choosing a transducer mount, consider the number of holes you are willing to drill, the compatibility with your boat's hull, the location in relation to the water level, and the type of sonar technology you plan to use. By taking these factors into account, you can select the most suitable transducer mount for your fish finder installation.

Drilling and sealing holes

Before you start drilling, it is important to plan the location of the holes carefully. Avoid drilling directly behind the ribs or through-hull fittings. The best practice is to mount the transducer between two ribs on the aluminum boat. Additionally, ensure that the transducer is at least one foot away from the engine's lower unit to prevent air bubbles from interfering with the propeller.

Once you have identified the correct location, you can begin drilling. Drill the holes with a drill bit that is slightly smaller than the screws you will be using. This will create a tight fit for the screws and help with sealing. After drilling, clean the area around the holes to remove any debris or residue.

To seal the holes, you can use silicone or marine epoxy. Apply a generous amount of the sealant around the holes and on the screws themselves before inserting them. This will create a watertight seal and prevent leakage. Use rubber-coated washers for extra protection.

If you want to avoid drilling holes in the hull of your aluminum boat, there are alternative methods you can consider. One option is to use a transom mounting plate, which only requires drilling two holes and provides the flexibility to move or replace the transducer in the future. Another option is to use a nylon plate as an intermediate layer between the transducer and the hull. Mount the nylon plate to the hull, seal the mounting holes, and then attach the transducer to the plate.

In summary, drilling and sealing holes is a crucial step when installing a fishfinder on an aluminum boat. By choosing the right location, using the appropriate tools, and sealing the holes effectively, you can ensure a secure and watertight installation for your fishfinder.

Positioning the display

When positioning the display, it is important to choose a location that is easily accessible and within reach but also out of the way to avoid any obstructions while fishing. Consider where you will be sitting in the boat and ensure that the display is visible and comfortable for you to use. The display should be installed in an area that will not interfere with your fishing activities.

The standard base included with the fish finder can be used to mount the display. However, for a more versatile installation, consider using a gear track and adjustable track mount base. This will allow you to adjust the position of the display as needed.

If you are installing the fish finder on a kayak, you can also mount the display on a gear track or use a permanent mount bolted to the kayak. For a stronger connection, bolting the display to the kayak is recommended. Additionally, some kayaks have factory brackets that can be used for mounting the display.

When positioning the display, it is crucial to ensure that the cables will be long enough to reach the display and that there is clearance for wires behind the panel. This is especially important if you are flush-mounting the display, which involves cutting an outline of the display on the console and mounting it flush with the surface. Always use the template provided by the manufacturer and carefully measure and mark the cutting area before making any cuts.

Another consideration is the number of displays you plan to install. In a small boat, it is common to have one display near the driver's seat and another in the bow near the trolling motor. Networking the second display to run through the transom transducer is a straightforward process.

Finally, when positioning the display, take into account the type of sonar technology you are using. For example, liveview sonar requires a directional transducer, so the positioning of the display in relation to the transducer may be important for optimal performance.

Overall, when positioning the display for your fish finder, choose a location that is convenient, accessible, and practical. Consider the mounting options available, the cable lengths, and the type of sonar technology you are using. By following these instructions and considerations, you can ensure that your fish finder display is installed in the best possible position on your aluminum boat.

Attaching the transducer

Choose the Right Transducer Mount:

Before attaching the transducer, it's essential to select the appropriate mount. For aluminum boats, it's recommended to use a plastic transducer mount to avoid potential electrolysis problems caused by metal transducer mounts. You can purchase a transducer mounting plate or cut a piece of PVC or polyethylene board to use as a mount.

Prepare the Transducer Mount:

If you're using a mounting plate or board, you'll need to attach it to the transom of your boat securely. You can use marine epoxy, silicone sealant, or bolts with rubber-coated washers to ensure a watertight seal. Make sure to follow the manufacturer's instructions for proper installation.

Attach the Transducer:

Once the mount is securely in place, you can attach the transducer to it. Follow the manufacturer's instructions to align the transducer with the water level for optimal performance. You may need to adjust the height or angle of the transducer to get the clearest signal.

Secure the Transducer Cable:

After the transducer is attached, you need to route the transducer cable neatly and securely. Run the cable over the transom, using cable management clips or tabs to keep it in place. Avoid putting screws on the outside of the transom for cable holders.

Finalize the Installation:

Before tightening all the connections, double-check that the transducer is at the correct depth. If it's too deep, it may create a roostertail, and if it's too shallow, the signal won't be strong enough. Refer to the fish finder's manual to ensure the transducer is positioned correctly.

By carefully following these steps, you can successfully attach the transducer for your fish finder on your aluminum boat. Remember to take your time, work neatly, and refer to the manufacturer's instructions to ensure a proper installation.

Running the cables

Firstly, decide on the best route for the cables to run from the fish finder's display unit to the transducer. The cables will need to be secured and protected to ensure they don't get damaged or tangled. One option is to use cable management clips to attach the cables to the surface of the boat. These clips can be found at marine supply stores or online. Another option is to drill holes in the boat and run the cables through them, but this is a more permanent solution and requires careful planning to avoid drilling into any structural components.

When running the cables, it's important to keep them away from any moving parts or sharp edges that could damage the insulation. Use cable ties or electrical tape to secure the cables and protect them from abrasion. If the cables need to make sharp turns, use conduit or tubing to guide them and prevent kinking.

If the cables need to pass through the transom (the vertical section at the back of the boat), carefully drill a hole and use a rubber grommet to protect the cables. The hole should be just large enough for the cables to fit snugly, and it's important to seal it with marine-grade sealant to prevent water ingress.

For a neater installation, consider using wire looms or split corrugated tubing to bundle and protect the cables. This will also make it easier to add or remove cables in the future. When bundling cables, ensure that they are compatible and can be routed together without causing interference. Thicker cables may require larger conduits or tubing.

Finally, when running cables to the display unit, leave enough slack to allow for adjustments. The display unit should be mounted on a flexible arm or gear track to provide some movement. This will make it easier to view the screen from different angles and make adjustments if needed.

By following these steps and taking your time, you can ensure that your fish finder cables are installed securely and safely, providing a reliable connection between the display unit and the transducer.

Frequently asked questions