Garmin GT15M-TM Transom Mount Transducer - 8-Pin

Upgrade your boating and fishing setup with the Garmin GT15M-TM transom mount transducer, a reliable choice for anglers seeking superior underwater visibility. This 8-pin powerhouse delivers mid-band CHIRP sonar that paints a vivid picture of the water column, from sharp bottom contours to distinct fish targets. Whether you're chasing trophy bass in shallow bays or probing deeper freshwater haunts up to 1,900 feet, it excels at separating targets for confident hooksets.

Key Specifications That Drive Performance

Crafted for real-world marine conditions, the GT15M-TM stands out with specs tailored for clarity and range. Its 85-165 kHz mid-CHIRP frequency sweeps across a broad spectrum, optimizing resolution in varied depths. The 600-watt power for traditional sonar (and 500 watts for ClearVü/SideVü scanning) ensures strong signals even in challenging environments like murky lakes or windy days on the water.

• Mounting: Transom mount, adjustable for 0-70 degree angles to fit most hulls seamlessly.
• Cable: 30 feet of durable wiring for flexible routing from transom to your Garmin display.
• Beamwidth: 24-16 degrees, providing wide coverage without sacrificing detail.
• Depth Capability: Rated to 1,900 feet in freshwater, with temperature sensing for spotting thermoclines.

Why Anglers Trust the GT15M-TM for Everyday Fishing

Imagine idling over a promising structure and watching crisp, wide fish arches emerge on your screen, each one standing out with excellent separation. That's the GT15M-TM in action—designed for fishermen who demand bottom definition as clear as glass. It cuts through clutter to reveal structure, bait schools, and game fish with precision, making it a go-to for tournament pros and weekend warriors alike.

Beyond traditional 2D sonar, its compatibility with ClearVü and SideVü (at 500 watts) adds photo-like down and side imaging, helping you pinpoint wrecks, drop-offs, and hidden ledges without guesswork. Pair it with popular Garmin chartplotters, and you'll unlock layered sonar views that transform how you fish.

Effortless Transom Installation for Quick Setup

Setting up the GT15M-TM is straightforward, even for DIY boaters. The included transom mount brackets secure firmly to your hull, and the adjustable design accommodates deadrise angles up to 70 degrees. Route the 30-foot cable neatly through existing conduits, connect the 8-pin plug to your compatible Garmin unit, and you're scanning in minutes. Pro tip: Position it slightly off-center from the propeller wash for the cleanest readings, and test at various speeds to dial in the perfect running angle. Always double-check your boat's transom material to ensure a solid bond that withstands waves and wakes.

Built to Last with Garmin's Proven Reliability

Garmin engineers this transducer for the rigors of marine life, from freshwater reservoirs to coastal inlets. The rugged housing resists corrosion and impacts, while the 2-year limited warranty gives peace of mind. It's not just about specs—it's about consistent performance that helps you catch more fish, day after day.

Frequently Asked Questions

Ready to see what's really below your boat? The Garmin GT15M-TM turns every trip into a sonar showcase, helping you fish smarter and catch bigger.