Commercial
Best Fish Finders for Pontoon Boats
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Updated July 2026 · FishFinders.co Editorial
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Pontoon boats present specific fish finder challenges: the twin-tube hull creates interference zones for standard transom mounting, and the larger platform often benefits from a larger screen than entry-level units. Here's what works on pontoons.
7-inch CHIRP + SI/DI unit — the right size for a helm-mounted pontoon fish finder. Readable in the elevated console position typical of pontoon helms, manageable screen size for a leisure craft.
9-inch screen is the practical sweet spot for a pontoon helm — large enough to see at a distance, MEGA SI produces outstanding side-imaging clarity for finding drop-offs and structure under the pontoon's wider swing radius.
A dedicated mount for positioning the transducer on a trolling motor shaft or on a pontoon tube — the preferred mounting solution for pontoon boats where transom-mount approaches the propeller wash from the main outboard.
Transducer Placement on a Pontoon
The main outboard's prop wash directly behind a pontoon creates interference for transom-mounted transducers. Better options: mount the transducer on the trolling motor shaft (if the pontoon has one), use a shoot-through-hull mount inside one of the aluminum tubes (aluminum is NOT suitable for shoot-through — use only through-tube transducers designed for aluminum), or use a mounting bracket that positions the transducer ahead of the main outboard's turbulence zone on one of the tubes.
Frequently Asked Questions
Can I mount a transducer on an aluminum pontoon tube?
Aluminum hulls don't work for in-hull (shoot-through) transducer mounting — aluminum reflects the sonar signal rather than transmitting it. Options are: through-hull (drilling the tube and using an appropriate marine sealant), trolling motor mount, or a dedicated bracket that positions a standard transom-mount transducer in undisturbed water.
What size fish finder do I need for a pontoon boat?
7–9 inch screens are the sweet spot for pontoon boats. Smaller units are hard to read from the helm position. Larger units (12 inch+) are typically overkill for recreational pontoon fishing unless you're running a tournament-focused fishing pontoon.
Do pontoon boats need side imaging?
Side imaging is particularly useful on pontoon boats because they cover more lake area per trip — the side imaging capability lets you scan large swaths of water while motoring around, identifying structure and depth changes much more efficiently than driving slow grid patterns.