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.
Key Features
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Mid-Band CHIRP (85–165 kHz): Provides a perfect balance between deep-water penetration and high-resolution imaging in shallower zones.
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Target Separation: Delivers the clarity needed to distinguish between baitfish and larger predators or to see individual fish holding tight to bottom structure.
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Depth & Temperature: Includes an integrated temperature sensor for monitoring water conditions and spotting thermoclines.
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Transom Mount: Features a versatile bracket compatible with transom angles from 0° to 70°, ensuring easy installation on almost any hull type.
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8-Pin Connector: Designed for direct plug-and-play with compatible 8-pin Garmin head units.




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