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The Garmin GT51M-TH (Part Number: 010-01966-10) is a thru-hull, all-in-one transducer designed for coastal and offshore vessels that require high-precision sonar imaging. This version features a stainless steel stem and is specifically engineered to provide consistent performance on boats with a deadrise, ensuring the sonar beam is oriented vertically for accurate readings.
Mid-Band CHIRP Traditional Sonar: Operates in the 80-160 kHz range with 600 W of power. This frequency provides a versatile balance between deep-water penetration and crisp target separation, making it ideal for tracking bottom and identifying fish arches in diverse marine environments.
CHIRP ClearVü & SideVü: Utilizing 500 W per element, these scanning modes operate at 260/455 kHz. ClearVü provides a photographic view of structures and fish directly beneath the hull, while SideVü offers wide-angle coverage of the water column to either side of the vessel.
Temperature & Depth: Includes a fast-response built-in temperature sensor to monitor thermal changes in the water column accurately.
Thru-Hull Configuration: The stainless steel housing is designed for permanent installation through the hull. It is supplied with a high-performance fairing block that can be cut to match the boat’s specific deadrise angle (up to 25°), ensuring the transducer remains level for optimal beam orientation.
Offshore Durability: The materials and mounting style are selected for durability in saltwater environments and are capable of maintaining clear sonar returns at higher speeds compared to transom-mounted alternatives.
Connectivity: Features a 12-pin connector for direct integration with compatible sonar-enabled chartplotters and fishfinders.
| Feature | Specification |
|---|---|
| Manufacturer | Garmin |
| Model | GT51M-TH |
| Part Number | 010-01966-10 |
| Mounting Type | Thru-Hull (Stainless Steel) |
| Connector | 12-pin |
| Cable Length | 5 ft. + 30 ft. extension cable |
| Traditional Frequencies | CHIRP Mid-band (80-160 kHz) |
| Scanning Frequencies | ClearVü/SideVü CHIRP 260/455 kHz |
| Transmit Power (Traditional) | 600 W |
| Transmit Power (Scanning) | 500 W |
| Maximum Depth (Traditional) | 1,800 ft. |
| Maximum Depth (ClearVü) | 1,000 ft. |
| Maximum Reach (SideVü) | 750 ft. |
| Beamwidth (Traditional) | 24°–13° |
| Beamwidth (ClearVü) | 2.0°x51° @ 260 kHz / 1.4°x29° @ 455 kHz |
| Supported Deadrise | 0° to 5° |
| Sensors | Depth and Temperature |
All-in-One Solution: Provides Traditional CHIRP, CHIRP ClearVü, and CHIRP SideVü scanning sonar in a single thru-hull housing.
Target Separation: Optimized for coastal and offshore fishing with high-sensitivity CHIRP for superior target definition.
Imaging Quality: ClearVü provides nearly photographic images of objects below the boat, while SideVü provides clear views of structure and fish to the sides.
Construction: Rugged stainless steel stem designed for use in harsh maritime environments.
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