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The Garmin GT15M-THF (12-degree Tilt) is a high-performance thru-hull transducer designed for midsize fishing boats and cruisers. It features 600 watts of power and Mid-band CHIRP technology, which provides a balanced range of frequencies to deliver exceptional target separation and clear fish arches.
The 12-degree tilted element is specifically engineered for boat hulls with a deadrise angle between 8° and 15°. By tilting the internal sonar element, it ensures the beam points straight down toward the bottom without the need for a bulky fairing block, maintaining a clean, flush-mount profile that minimizes drag.
Mid-band CHIRP (85–165 kHz): Sweeps through frequencies to provide high-definition sonar images, making it easier to distinguish individual fish from structure.
Flush-Mount Stainless Steel: The low-profile housing sits nearly level with the hull, reducing water turbulence and improving sonar clarity at high speeds.
Tilted Element Design: Compensates for the hull deadrise to ensure accurate depth readings and vertical sonar orientation.
Auto-ID Technology: Features a plug-and-play system that allows compatible Garmin chartplotters to automatically recognize and configure the transducer.
RapidReturn™ Compatible: Optimized for faster sonar update rates to provide more immediate feedback on your display.
| Feature | Specification |
| Manufacturer | Garmin |
| Part Number | 010-02868-01 |
| Mounting Type | Thru-Hull Flush Mount |
| Housing Material | Stainless Steel |
| Connector | 8-pin |
| Sonar Type | Traditional CHIRP (Mid-Band) |
| Frequency Range | 85–165 kHz |
| Transmit Power | 600 W (RMS) |
| Beamwidth | 24° to 16° |
| Maximum Depth | 1,900 ft (580m) Freshwater / 1,200 ft (365m) Saltwater |
| Supported Deadrise | 8° to 15° (12-degree Tilt) |
| Cable Length | 50 ft (15 m) |
| Sensors | Depth and Fast-response Temperature |
Hull Compatibility: Suitable for all hull materials including fiberglass, composite, steel, aluminum, and wood.
Metal Hull Requirement: For steel or aluminum hulls, a galvanic isolation kit (included) must be used to prevent corrosion.
Mounting Hole: Requires a 73 mm (2 7/8 in.) hole saw for fiberglass hulls or a 75 mm (3 in.) hole saw for metal hulls.
Auto-ID Technology: Enables the sonar to automatically configure itself when connected to a compatible Garmin chartplotter.
RapidReturn™ Sonar: Fully compatible with faster sonar update rates for real-time feedback.
GT15M-THF Transducer (12-degree tilt)
Jam nut and Washer
Thread and Hull Isolators
Documentation
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