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The Garmin GT15M-TM Transom Mount Transducer is a high-performance, mid-band CHIRP sonar unit designed for serious anglers who prioritize exceptional target separation and bottom definition. By sweeping across a range of frequencies rather than a single pulse, it provides crisp, clear fish arches and distinct structure details even at significant depths.
Its streamlined design and high power rating make it a reliable choice for both coastal and deep-water freshwater applications, effectively cutting through signal noise to provide accurate readings up to 1,900 feet.
Mid-Band CHIRP (85–165 kHz): Provides a perfect balance between deep-water penetration and high-resolution imaging in shallower zones.
Target Separation: Delivers the clarity needed to distinguish between baitfish and larger predators or to see individual fish holding tight to bottom structure.
Depth & Temperature: Includes an integrated temperature sensor for monitoring water conditions and spotting thermoclines.
Transom Mount: Features a versatile bracket compatible with transom angles from 0° to 70°, ensuring easy installation on almost any hull type.
8-Pin Connector: Designed for direct plug-and-play with compatible 8-pin Garmin head units.
| Feature | Specification |
| Manufacturer | Garmin |
| Part Number | 010-12402-10 |
| Mounting Type | Transom Mount |
| Connector | 8-pin (Orange) |
| Sonar Type | CHIRP Traditional (Mid-Band) |
| Frequency Range | 85–165 kHz |
| Transmit Power | 600 W |
| Beamwidth | 24°–13° |
| Maximum Depth | 1,900 ft. (Freshwater) |
| Cable Length | 30 ft. (9 m) |
| Supported Deadrise | 0°–70° Transom |
| Sensors | Depth and Temperature |
CHIRP Technology: By sweeping through a range of frequencies (85-165 kHz), it offers far superior target separation compared to standard single-frequency transducers.
Versatile Mounting: The bracket is adjustable to match various transom angles, ensuring the transducer remains parallel to the water surface for the best signal return.
Deep Water Capability: With 600W of power, it is capable of reaching nearly 2,000 feet, making it suitable for both coastal and deep lake fishing.
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