How to Install a Fishfinder on a Fiberglass Boat in 2024?

installing a fishfinder on a fiberglass boat
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So you are here because you want to install your fish finder on your boat right? okay in this article, I will teach you how to install a fishfinder on a fiberglass boat without any hassle. So, let’s get started.

An underwater Fishfinder is a device used by fishermen, anglers, and boaters to see what is below the water’s surface. There are many different features available in today’s fish finders that weren’t previously available.

The installation of a fishfinder on a fiberglass boat is not complicated, but it does require some expertise. This post will cover the basics of installing a fish finder and some common mistakes to avoid during the process.

To install a Fishfinder on your fiberglass boat you will need:

  1. A fishfinder – either an echo sounder or side imaging sonar model (this depends on the type of fishing you are doing such as roach fishing, carp fishing, salmon fishing, perch fishing, etc).
  2. Mounting hardware – bolts, nuts, washers, and mounting brackets that are specific to your boat’s make and model.
  3. Electrical wiring kit for connecting power from the engine compartment to where the unit will be mounted.
  4. Clearance space beneath a deck for placement of the unit.
  5. Ability to drill holes in the fiberglass for installation.

Steps to Install a Fishfinder on a Fiberglass Boat

You can easily Install Fishfinder on your boat by following these 7 steps. So let’s take a look at these steps to know how it works. After reading, this article must read this one also the best fish finders under 1500 dollars.

how to install a fishfinder on a fiberglass boats
Steps to install a fishfinder on your fiberglass boat

Creating The Foundation:

One of the major reasons fiberglass fishing boat owners are often frustrated is setting up their binnacle mount. If you’re on this side, here’s how to get it done in three simple steps:

Choose The Location: There are many factors to consider when choosing the best place for your fishfinder. You’ll want a location with enough free space that is easy to see from where you sit in the cockpit.

Make sure there is an extra room because depending on what features and accessories you choose, it may take up more than one plug slot or require different outlets altogether to run properly!

Before installation, take your time. You will not be able to change the things you have done after installation.

Drill The Mounting Holes: Drilling a hole can be an intimidating task. When you’re drilling, the temptation is to go slowly so that your drill doesn’t overheat and may even stop working altogether (if it does work properly).

However, if you keep going at full speed with confidence in yourself and your power tool then there will be less chance of overheating or breaking down during this process.

Wiring: To ensure that you have a seamless connection, be sure to drill additional holes for the wires of your fishfinder.

The first step is finding an existing hole that it can fit through and then securing it with silicone sealant.

Next, secure each bolt on the binnacle by applying some sealant as well before tightening them down with a wrench.

Lastly, use some electrical tape to wrap up the wires and keep them out of the way while still providing plenty of slack for an easy installation process later on.

Switch On Your Fishfinder

To ensure the best protection, it’s important to make sure that you don’t cut the in-line fuse provided by your manufacturer when wiring.

This will allow a circuit fault elsewhere on their system to be automatically disconnected before any of the wires are harmed or start sparking and causing fires.

First off, feed your power leads through from one side (you’ll have drilled this hole already).

You should still have enough slack, but not so much extra space for additional wirework as well unless needed due to some variation with how electricians/electricity works where you’re at currently!

If there are female connectors instead of male terminals available on your own particular panel box setup, take care during assembly: using tie-wraps or clamps can secure them to the proper place and stop them from becoming disconnected or caught up in any way.

Complete The Installation

You can now mount that transducer! Simply hold it against the boat’s surface and follow these instructions to find a good spot.

Once you’ve found an ideal location, mark where the bracket should be mounted with chalk or tape so your hands don’t slip off during installation.

Hold onto those screws tightly- they’re not as happy when they have nothing to do!

You may be wondering how to get the wiring in your dash. Never fear, we have you covered! Run the wire for your transducer through and coil it up with clamps so nothing gets tangled or snagged on anything.

After that, keep it separate from any engine wires as well as VHF cables–these can interfere with signal strength if they’re too close together.

Drill the holes in a way that will allow you to screw them closed tightly. Coat both sides of your screws with adhesive/sealant and carefully place one end into each hole, then tighten by hand or machine until it’s watertight.

If you are not happy with this guide then watch this video on mounting transducers in fiberglass boats.

Place the Fishfinder

Now, before you place the fishfinder in its spot on the binnacle mount behind your boat’s dashboard, seal off that hole with a clamshell vent!

This will keep water out while still allowing for easy access when it comes time to make connections. With all of those wires pulled through and connected properly the last step was too.

Installing a fishfinder can be time-consuming but it is worth the effort. It may take some trial and error to get your unit working, so make sure you consult any appropriate manuals before installing anything incorrectly or doing something that will damage your system in the process.


Can you mount a transducer inside a fiberglass boat?

A transducer can be mounted inside a fiberglass boat, but it is important to drill vent holes near the edge of the hole for water pressure on top and bottom surfaces to not cause damage.

How do you mount a transducer inside the hull?

The transducer is placed inside a clear plastic bag that has been partially filled with water. The wire tie is used to tighten the top and the bottom together so there are no leaks in between, then attach it securely on your boat or kayak hull surface.

Make sure both surfaces are wet before placing them next to each other for comparison purposes.

Can a transducer shoot through fiberglass?

A typical 600W transducer can transmit through 1/2″ to 5/8″ (12mm to 16mm) of fiberglass, but the thickness varies depending on where it is placed and how many layers are used.

Where to mount a fish finder transducer?

It is important to place the transducer high enough on the boat for its signal strength and low enough that water pressure does not damage the unit.


In conclusion, it is important to remember that installing a fish finder on a fiberglass boat takes time and patience. The process can be completed with the right tools and knowledge of how to work with these materials.

Those who are interested in fishing or boating should consider this before they purchase their next vessel for whatever reason.

One Comment

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