GT15M-THF 0° Through-Hull CHIRP Mid-Frequency Sonar

Yes, the Garmin GT15M-THF transducer is made of stainless steel and is compatible with a wide range of hull materials, including fiberglass, wood, composites, aluminum, and steel.

For installations on metal hulls (aluminum or steel), it is mandatory to use the included galvanic isolation components to prevent corrosion and ensure watertightness.

The "0 degrees" designation for this transducer indicates it is specifically designed and optimized for deadrise angles (also called "deadrise") ranging from 0 to 5 degrees. For optimal sonar performance, it is critical that the transducer’s angle matches as closely as possible the deadrise angle at the chosen installation location on your boat.

Yes, to achieve the best possible performance and avoid potential damage to the device or your boat, installation by a qualified marine installer is strongly recommended. It is also important to always wear safety glasses, hearing protection, and a dust mask when drilling, cutting, or sanding.

The required hole diameters depend on your boat's hull material:

For a fiberglass hull (solid or cored), a 73 mm (2 7/8 in) hole saw is required.For a metal hull (aluminum or steel), a 75 mm (3 in) hole saw is required.

For installations on aluminum or steel hulls, it is mandatory to use the galvanic isolation components supplied with the transducer. Omitting these components during installation would create galvanic corrosion, which could lead to water ingress around the transducer and damage your boat.

Yes, for optimal performance, the transducer must be mounted in a clean, non-turbulent water area. Here are key points:

Avoid mounting it behind strakes, struts, fittings, intake or discharge water ports, or anything that could create air bubbles. It must not be mounted in the propeller wash path, as this could cause cavitation.
On outboard or sterndrive-powered boats, it is usually mounted forward and near the engine(s).
On inboard-powered boats, it must be mounted forward and away from the propeller and the engine shaft.
The arrow on top of the transducer must align with the boat’s keel so the internal angle matches the keel angle.

Yes, it is necessary to update the software on your Garmin chartplotter when you install this transducer. This update ensures compatibility and optimal operation between the transducer and your Garmin device.

To avoid permanently damaging the transducer's surface, follow these recommendations:

Never use solvents such as white spirit, acetone, methyl ethyl ketone (MEK), or similar products.Do not use an electric sander or a pressure washer to clean the transducer.A mild detergent or rubbing alcohol can be used for cleaning.

The Garmin GT15M-THF transducer is made of stainless steel. This material provides robustness and broad compatibility with various hull types, including fiberglass, wood, composites, aluminum, and steel.

The GT15M-THF transducer is compatible with fiberglass, wood, composite, aluminum, and steel hulls. Its stainless steel construction makes it particularly suitable for metal hulls, unlike other models made of brass.

The Garmin GT15M-THF transducer is specifically designed for deadrise angles ranging from 0 to 5 degrees. It is crucial to check your boat's deadrise angle at the chosen installation location to ensure optimal sonar performance.

Hole diameters vary depending on your hull material:

For fiberglass hulls (solid or sandwich): a 73 mm (2 7/8 in) hole is required.For metal hulls (aluminum or steel): a 75 mm (3 in) hole is required.

Yes, using the included galvanic isolation components is mandatory when installing the GT15M-THF transducer on an aluminum or steel hull. Failure to install them could result in galvanic corrosion and potential water ingress around the transducer.

For optimal performance, the transducer must be installed in an area of clean, non-turbulent water. Below are general guidelines:

Outboard and sterndrive boats: Forward and near the engine(s).Inboard boats: Forward and away from the propeller and propeller shaft.Longitudinal-stepped hulls: Forward of the first step.Deep-keeled boats: At a slight angle pointing forward, parallel to the centerline.Narrow-keeled boats: 25 to 75 cm ahead of the keel and no more than 10 cm to the side of the centerline.Displacement hulls: About one-third back from the waterline length from the bow, and 150 to 300 mm to the side of the centerline.The transducer must not be mounted behind frames, stringers, fittings, water intakes or discharges, or anything that could create air bubbles or turbulence.

The transducer must always be used when submerged. Operating it in air can cause damage due to overheating.For cleaning, never use solvents such as white spirit, acetone, MEK (methyl ethyl ketone), or similar products, as they can permanently damage the transducer surface.Do not use an electric sander or high-pressure cleaner to clean the transducer.Do not pull or lift the transducer by its cable to avoid damaging it.

To achieve optimal performance and prevent potential damage to the device or your boat, installation by a qualified marine installer is recommended.

For the transducer installation, you will need the following tools:

A drill and a 3 mm (1/8 in) bitA wrench suitable for nuts up to 75 mmMarine sealant (flexible, fast-curing type for below the waterline)Mild household detergent or rubbing alcoholSandpaperMasking tapeWaterproof electrical tapeA 73 mm (2 7/8 in) hole saw for fiberglass hulls or a 75 mm (3 in) hole saw for metal hulls.Water-based antifouling paint and grommets may be required as optional items.

Yes, the GT15M-THF transducer is made of stainless steel and is specifically designed for installation in aluminum or steel hulls, as well as fiberglass, wood, or composite hulls. It includes the necessary galvanic isolation components to prevent corrosion in metallic environments.

Yes, cutting or splicing the transducer cable, unless required for connection to a specific black box sonar unit, may void your warranty. It is recommended not to modify the cable.

During installation, it is crucial to rotate the depth sounder from inside the hull until the arrow on top of the transducer points toward the keel of the boat. This alignment is essential for the internal angle of the transducer to match the keel angle of the boat, ensuring optimal performance.