Sonde Garmin GT15M-IH en plastique, sur la coque, CHIRP en bande moyenne (85-165 kHz, 600 W) (8 broches) - Garmin

Sonde GT15M-IH - intérieure CHIRP moyenne fréquence - visuel officiel Garmin 2

Sonde GT15M-IH - intérieure CHIRP moyenne fréquence - visuel officiel Garmin 3

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Garmin

010-12402-00

GT15M-IH CHIRP transducer - in-hull mid-frequency

Designed for solid fiberglass hulls, the Garmin GT15M-IH transducer provides a CHIRP mid-band solution (85-165 kHz, 600 W) for accurate depth readings without drilling. Ideal for fast boats, it maintains sonar performance at high speed, avoiding drag and external damage. Includes: four plastic fairing blocks for deadrise angles from 0° to 25° and mounting hardware.

Installation: Interior

Interior Rear panel Transom

Retail priceBenefit from the professional rate

£119.89 GBP

£119.89 GBP ~~£146.59 GBP~~

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In stock

Free pickup point from €150 in France
Pickup at Skysat possible

Custom installation

Trust Skysat to install the equipment on board

Request a quote

Installers near you

thanks to our network of approved installers

Find an installer

Support service

Opt for additional installation assistance

Technical specifications

Supported sonar technologies	CHIRP mid-band
Fishfinder frequencies	85-165
Operating temperature	0 to 50
Peak power	600.0
Max power consumption	None
Sonar connector type	8-pin
Typical power consumption	None
Compatible displays	Any Garmin fishfinder compatible with 8-pin transducer
Bus compatibility	Garmin owner (8-pin)
Wired network	Garmin owner (8-pin)
Wireless connectivity	No
Mounting type	Inside hull
CHIRP high frequency	165
CHIRP low frequency	85
Deadrise angle compatibility	0-25
Allégation de durabilité	Less prone to external damage, ideal for trailerable boats
Fishing type	All types
Hull Material Compatibility	Solid fiberglass
Included accessories	Four corner tanks in plastic (0°, 5°, 12°, 20°)
Installation Benefit No Hull Drilling	Yes
Integrated speed sensor	No
Integrated temperature sensor	No
Max depth reading	549.0
Max Hull Thickness Mm	16
Performance At High Speed	Excellent
Release year	2015.0
Signal Strength Reduction In Hull	Yes
Sonar Type	Traditional CHIRP
Transducer material	Plastic
User level	Intermediate / Advanced

Detailed description

Designed for solid fiberglass hulls, the Garmin GT15M-IH is an in-hull transducer providing CHIRP mid-band capabilities. This 600 W transducer operates in the 85 to 165 kHz frequency range, delivering depth readings up to 579 meters (1900 feet) under optimal conditions. The in-hull installation eliminates the need to drill through the hull bottom, reducing drag and protecting the transducer from external damage.

Performance and compatibility

The GT15M-IH is specifically suited for fiberglass hulls up to 16 mm thick and deadrise angles from 0 to 25 degrees, using the four supplied plastic tanks. It excels at maintaining accurate depth readings at high speeds, a feature not always found in transom-mounted transducers that can be affected by turbulence. Unlike through-hull transducers that require a more invasive and often professional installation, the GT15M-IH offers a non-penetrating alternative. It provides only traditional CHIRP depth data and can be supplemented with additional Garmin transducers (such as GT36UHD-TM or GT56UHD-TM) via an optional Y-cable to add ClearVü and SideVü functionality.

Installation and integration

Installing the Garmin GT15M-IH involves bonding the tank inside the hull, filling it with antifreeze fluid or mineral oil, then inserting the transducer. This approach minimizes signal interference typically caused by turbulence from propellers or other hull features. The transducer is compatible with many Garmin ECHOMAP and GPSMAP chartplotters, though an adapter cable may be required for some models. Its 8-pin design ensures standardized connection to compatible Garmin systems.

Documentation

Type	Nom
	User Manual - Garmin Transducer Placement Guide
	Installation Instructions - Garmin GT15M-IH transducer installation guide

Expert opinion

Pol CONIN

Digital Manager

« Installation and performance of the Garmin GT15M-IH CHIRP transducer »

The Garmin GT15M-IH transducer is a relevant solution for fiberglass boat owners who prioritize non-invasive installation and reliable high-speed performance. Its in-hull design is particularly advantageous for racing sailboats or fast motorboats where drag reduction is critical, or simply for those who wish to avoid any structural modification of the hull. This 600 W CHIRP transducer ensures consistent depth detection even when the boat is moving at high speed, a point where transom-mount transducers can sometimes show limitations due to cavitation.

For successful installation, it is imperative to respect hull constraints: only for solid fiberglass with a maximum thickness of 16 mm and a deadrise angle between 0 and 25 degrees. The four supplied tanks allow the transducer to be adapted to these different inclines. Precise positioning in the bilge, away from turbulence generated by the propeller or other appendages, is crucial. A preliminary testing phase before final attachment is strongly recommended to validate the optimal location. Filling the tank with an appropriate fluid (antifreeze or mineral oil) is essential for signal transmission.

Compared to through-hull transducers, which generally offer superior performance but require drilling and more complex installation, the GT15M-IH offers an interesting compromise. It provides enhanced protection against shocks and marine debris, a clear advantage for trailered boats. However, it is important to note that as a traditional transducer, it does not provide ClearVü or SideVü imaging functions autonomously. It must be paired with other compatible Garmin transducers via a Y-cable to extend these capabilities. It also does not include a temperature or speed sensor. This model should therefore be considered a reliable primary depth transducer for specific applications, rather than an all-in-one imaging solution.

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GT15M-IH CHIRP transducer - in-hull mid-frequency

£119.89 GBP

£119.89 GBP ~~£146.59 GBP~~

Frequently Asked Questions

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What type of transducer is the Garmin GT15M-IH?

The Garmin GT15M-IH is an in-hull transducer made of plastic. It uses CHIRP technology in the mid-band for optimal performance.

What is the operating frequency range of the GT15M-IH transducer?

The GT15M-IH transducer operates on a CHIRP mid-band frequency range, from 85 to 165 kHz. This band provides detailed depth readings.

What is the transmit power of this Garmin transducer?

The Garmin GT15M-IH transducer has a transmit power of 600 W (RMS), providing strong detection capability.

Does the GT15M-IH transducer provide water temperature or speed data?

No, hull-mounted transducers like the GT15M-IH typically do not include temperature or speed sensors. They only provide standard CHIRP depth data.

What are the benefits of using an in-hull transducer like the GT15M-IH?

The main benefits of an in-hull transducer include:

No hull penetration required.Reduced drag as the transducer is installed inside the hull.Protection from external damage (trailers, underwater obstacles).Maintenance of accurate depth readings even at high speeds.

What type of connector does the GT15M-IH transducer use?

The Garmin GT15M-IH transducer is equipped with an 8-pin connector, compatible with compatible Garmin fishfinders and chartplotters.

For which types of boat hulls is the GT15M-IH transducer compatible?

The GT15M-IH transducer is designed exclusively for solid fiberglass hulls. It is compatible with hulls up to 16 mm (5/8 in) thick.

Can the GT15M-IH transducer be installed on metal, wood, or cored hulls?

No, the GT15M-IH transducer is not recommended for metal, wood, or cored hulls. It is specifically designed for solid fiberglass hulls.

What is the maximum fiberglass hull thickness supported by this depth sounder?

The Garmin GT15M-IH depth sounder is compatible with solid fiberglass hulls up to a maximum thickness of 16 mm (5/8 in).

Which hull deadrise angles are suitable for installing the GT15M-IH?

The GT15M-IH transducer is recommended for hulls with a deadrise angle between 0 and 25 degrees. Four plastic tanks are provided to accommodate these different angles.

Does the GT15M-IH transducer offer ClearVü or SideVü functions?

No, the GT15M-IH transducer provides only traditional CHIRP depth sounder data. To add ClearVü or SideVü functions, it can be supplemented with other compatible Garmin transducers (such as GT36UHD-TM or GT56UHD-TM) via an optional Y-cable.

Can I use the GT15M-IH with other Garmin transducers for additional views?

Yes, you can supplement the GT15M-IH transducer with other Garmin transducers, such as the GT36UHD-TM or GT56UHD-TM models, to add ClearVü and SideVü functionality. This requires the use of an optional Y-cable.

What are the criteria for choosing the installation location of the GT15M-IH transducer?

For optimal performance, the transducer must be mounted:

On a solid fiberglass hull area, without dead air space or core material.In the bilge area, near the keel and the transom.As flat as possible.Away from through-hulls, protrusions, seams, and turbulence generated by the propeller.

What tools and materials are required to install the GT15M-IH transducer?

To install the GT15M-IH transducer, you will need:

A Phillips screwdriver size #1.Grit 220 sandpaper.Marine-grade adhesive suitable for the hull material.RV/marine antifreeze or mineral oil.Rubbing alcohol.

How to choose the correct installation tank based on my hull's deadrise angle?

Tank choice depends on your hull's deadrise angle:

For an angle of 0° to 3°, install the tank labeled 0°. For an angle of 4° to 8°, install the tank labeled 5°. For an angle of 9° to 16°, install the tank labeled 12°. For an angle of 17° to 25°, install the tank labeled 20°.

Is it possible to test the transducer before permanently installing it?

Yes, it is strongly recommended to test the mounting location before permanent installation. You can place the transducer in a plastic bag filled with water, position it on the wetted hull at the chosen location, and monitor the feedback on your chartplotter or depth sounder to verify performance.

What type of fluid should be used to fill the transducer's housing?

The GT15M-IH transducer housing must be filled with RV/marine antifreeze fluid or mineral oil. This fluid ensures proper transmission of the sonar signal through the hull.

How to measure the deadrise angle of my hull for installation?

You can measure the deadrise angle using a smartphone app, an angle finder, a protractor, or a digital level. It is important to measure this angle specifically at the location where you plan to install the transducer, as the hull may have multiple different angles.

Is professional installation required for the GT15M-IH transducer?

Although hull-mounted installation is less intrusive than through-hull transducers, professional installation is recommended to achieve the best results. This ensures optimal placement and maximum performance of the transducer.