Installation

YOUR HULL SPEAKS

In-hull mount. Maximum transfer.

Five steps to optimal acoustic coupling. In-hull mounting below the waterline is the recommended method.

Developed using published research on fish acoustic behavior

Batch #2 preorder · 3 of 50 left

Batch #1 sold out. Batch #2 is open now — estimated dispatch in 5–7 days.

Shop Tuna Magnet Back to Home
5
Install Steps
IP68
Saltwater Rated
12V
Marine Power
In-hull mount Drop in the water Field-tested offshore
Tuna Magnet acoustic device

Step By Step

Your Hull Becomes The Speaker

In-hull mounting delivers the strongest acoustic coupling. Drop-in deployment is available when hull access is limited.

Hull acoustic coupling diagram
Image needed hull-speaker-diagram.jpg

Hull acoustic coupling diagram

AI image prompt

Technical cutaway illustration: sportfishing boat hull cross-section below the waterline showing a white dome Tuna Magnet acoustic transducer mounted in-hull against the inside fiberglass surface, thin white mineral oil acoustic coupling layer between unit and hull, stylized teal concentric sound waves transmitting through the hull into deep navy open ocean. Premium marine engineering infographic, clean modern diagram style, deep navy and teal accent palette, Gravity Fishing visual system, no text labels, no logos, no watermarks

Save as assets/hull-speaker-diagram.jpg and push the theme, or upload in the theme editor. Full catalog: assets/image-prompts.json

Recommended

In-Hull Mount

Mount inside the hull below the waterline. Vibrations transfer through the hull into surrounding water.

In hull mount installation
Image needed install-method-in-hull.jpg

In hull mount installation

AI image prompt

Documentary installation photograph inside a sportfishing boat hull bilge below the waterline: offshore angler mounting the white dome Tuna Magnet acoustic transducer against the interior fiberglass hull, continuous marine sealant bead visible around the 316L stainless mounting ring, warm LED work light, compact tools nearby. Gravity Fishing premium offshore marine brand aesthetic, realistic documentary style, shallow depth of field, photorealistic 8K detail, no text, no logos, no watermarks

Save as assets/install-method-in-hull.jpg and push the theme, or upload in the theme editor. Full catalog: assets/image-prompts.json

Optional

Drop-In Water

Deploy directly in the water when in-hull mounting is not practical.

Drop in water deployment
Image needed install-method-drop-in.jpg

Drop in water deployment

AI image prompt

Documentary offshore photograph: sportfishing boat drifting in deep Atlantic blue water, white dome Tuna Magnet acoustic transducer suspended on black marine cable beside the hull for drop-in deployment, gentle swell and wake, crew visible on deck. Gravity Fishing premium offshore marine brand aesthetic, rich teal-navy color grade, cinematic documentary style, photorealistic 8K detail, no text, no logos, no watermarks

Save as assets/install-method-drop-in.jpg and push the theme, or upload in the theme editor. Full catalog: assets/image-prompts.json

In-Hull Mount Installation

Five steps to optimal acoustic coupling.

  1. Choose the installation area

    Select a mounting location inside the hull below the water line for direct acoustic transfer through the hull into surrounding water.

    Choose the installation area
    Image needed install-step-01-area.jpg

    Choose the installation area

    AI image prompt

    Close-up documentary photograph inside a boat hull bilge: weathered offshore angler hand pointing to a marked circular mounting area below the waterline on smooth fiberglass, chalk circle outline and faint pencil marks, prep tools nearby, warm LED work light. Gravity Fishing installation documentation style, shallow depth of field, photorealistic 8K detail, no text, no logos, no watermarks

    Save as assets/install-step-01-area.jpg and push the theme, or upload in the theme editor. Full catalog: assets/image-prompts.json

  2. Apply the sealant

    Apply a continuous bead of marine-grade sealant around the mounting ring, leaving a small opening unsealed for filling.

    Apply the sealant
    Image needed install-step-02-sealant.jpg

    Apply the sealant

    AI image prompt

    Close-up documentary photograph inside a boat hull: applying a continuous bead of marine-grade sealant around the 316L stainless mounting ring on fiberglass, caulk gun in hand, small gap deliberately left unsealed for later mineral oil fill, warm LED work light. Gravity Fishing installation documentation style, photorealistic 8K detail, no text, no logos, no watermarks

    Save as assets/install-step-02-sealant.jpg and push the theme, or upload in the theme editor. Full catalog: assets/image-prompts.json

  3. Mount the unit

    Press the unit firmly against the hull surface, ensuring full contact without trapped air pockets.

    Mount the unit
    Image needed install-step-03-mount.jpg

    Mount the unit

    AI image prompt

    Close-up documentary photograph inside a boat hull: both hands pressing the white dome Tuna Magnet acoustic transducer firmly against the prepared fiberglass hull surface, marine sealant squeezing slightly at the ring edge, ensuring full contact with no trapped air pockets, warm LED work light. Gravity Fishing installation documentation style, photorealistic 8K detail, no text, no logos, no watermarks

    Save as assets/install-step-03-mount.jpg and push the theme, or upload in the theme editor. Full catalog: assets/image-prompts.json

  4. Fill the cavity with oil

    Using a syringe, slowly fill the gap with white mineral oil until all air is displaced.

    Fill the cavity with oil
    Image needed install-step-04-oil.jpg

    Fill the cavity with oil

    AI image prompt

    Macro documentary photograph inside a boat hull: filling the gap between the white dome Tuna Magnet transducer and fiberglass hull with clear white mineral oil using a plastic syringe and small tube, visible air bubble being displaced, oil beginning to overflow slightly, warm LED work light. Gravity Fishing installation documentation style, photorealistic 8K detail, no text, no logos, no watermarks

    Save as assets/install-step-04-oil.jpg and push the theme, or upload in the theme editor. Full catalog: assets/image-prompts.json

  5. Final sealing

    Remove the filling tube and seal the remaining opening for optimal acoustic coupling.

    Final sealing
    Image needed install-step-05-seal.jpg

    Final sealing

    AI image prompt

    Close-up documentary photograph inside a boat hull: final sealing of the remaining opening with marine-grade sealant after mineral oil fill is complete, clean professional finish around the mounted white dome Tuna Magnet and stainless ring, warm LED work light. Gravity Fishing installation documentation style, photorealistic 8K detail, no text, no logos, no watermarks

    Save as assets/install-step-05-seal.jpg and push the theme, or upload in the theme editor. Full catalog: assets/image-prompts.json

Hull & Ring Preparation

  • Lightly sand the mounting area. Remove dust, grease, and contaminants with acetone or isopropyl alcohol.
  • White mineral oil is the recommended coupling fluid.
  • Prep the stainless steel ring the same way. Use acetone if applying 3M 5200.
  • After saltwater use, rinse with fresh water.
Hull sanding preparation
Image needed hull-prep-sanding.jpg

Hull sanding preparation

AI image prompt

Macro documentary photograph inside a boat hull: lightly sanding the circular fiberglass mounting area with a fine Scotch-Brite pad, fine dust particles visible, bare hull gelcoat texture, warm LED work light. Gravity Fishing installation prep documentation style, shallow depth of field, photorealistic 8K detail, no text, no logos, no watermarks

Save as assets/hull-prep-sanding.jpg and push the theme, or upload in the theme editor. Full catalog: assets/image-prompts.json

Hull cleaning with acetone
Image needed hull-prep-cleaning.jpg

Hull cleaning with acetone

AI image prompt

Macro documentary photograph inside a boat hull: cleaning the degreased circular mounting area with acetone on a lint-free cloth, glossy prepared fiberglass surface, solvent jar nearby, warm LED work light. Gravity Fishing installation prep documentation style, photorealistic 8K detail, no text, no logos, no watermarks

Save as assets/hull-prep-cleaning.jpg and push the theme, or upload in the theme editor. Full catalog: assets/image-prompts.json

Stainless ring preparation
Image needed ring-prep.jpg

Stainless ring preparation

AI image prompt

Macro product photograph on a dark teak workbench: 316L stainless steel Tuna Magnet mounting ring being prepped with light sanding and isopropyl alcohol wipe, marine hardware tools nearby, subtle saltwater patina on bench surface. Gravity Fishing premium marine product macro style, shallow depth of field, photorealistic 8K detail, no text, no logos, no watermarks

Save as assets/ring-prep.jpg and push the theme, or upload in the theme editor. Full catalog: assets/image-prompts.json

Q & A

Installation Questions

What is the recommended installation method?

In-hull mounting below the waterline is recommended for maximum acoustic transfer.

What coupling fluid should I use?

White mineral oil is recommended for in-hull installation.

How do I prep the hull and mounting ring?

Sand lightly, degrease, and clean with isopropyl alcohol or acetone.

Ready to Install?

Get Your Tuna Magnet

Marine-grade underwater acoustic technology engineered for chunk fishing and trolling.

€599,00

Marine-grade build · Secure checkout · Offshore engineered