Garmin B75M Bronze 20° Thru-Hull Transducer - 600W, 8-Pin

Discover Superior Underwater Clarity with the Garmin B75M Bronze Thru-Hull Transducer

Upgrade your boating experience with a transducer that delivers pinpoint accuracy beneath the waves. Designed for serious anglers and navigators, this bronze thru-hull model with a 20-degree tilted element mounts seamlessly through your hull, adapting to deadrise angles between 16 and 24 degrees. No fairing block required—just clean installation and immediate access to both traditional CHIRP and Spread Spectrum sonar scanning when paired with compatible Garmin units.

What sets this apart? Its broadband capabilities (80-130 kHz) combined with 600W power punch through murky waters to reveal fish-holding structures, bait schools, and bottom contours up to 900 feet deep. The integrated temperature sensor adds another layer of insight, helping you track water conditions that influence fish behavior. With a sturdy 39-foot cable and 8-pin connector, it's built for reliable integration into your Garmin marine network.

Key Performance Specs at a Glance

This spec sheet isn't just numbers—it's the foundation for exceptional target separation and coverage. The wider low-frequency beam excels at scanning broad areas for wrecks or drop-offs, while the narrower high-frequency beam hones in on individual fish with crystal clarity.

Why Bronze Construction Matters for Your Vessel

Bronze isn't chosen lightly. This corrosion-resistant material thrives in saltwater environments, maintaining peak performance season after season. The flush-mounted housing with a 2-inch shaft ensures minimal drag, preserving your boat's speed and fuel efficiency. For vessels with varying hull shapes, the 20-degree tilt eliminates the guesswork, aligning the beam perpendicular to the waterline for optimal returns without additional hardware.

Effortless Installation and Compatibility

Setting up this thru-hull transducer is straightforward for DIY boaters or pros. Drill a precise hole matching your hull's deadrise, secure the bronze housing with the included hardware, and route the 39-foot cable to your Garmin display. Detailed instructions guide you every step, covering sealant application to prevent leaks and proper wiring for 8-pin Garmin sounders.

It's a perfect match for Garmin's ecosystem, supporting advanced features like CHIRP sonar on black box modules or all-in-one chartplotters. Users often pair it with high-end units for side/down imaging hybrids, but it shines solo for basic depth and temp readouts. Pro tip: Position it forward of props and struts to avoid interference—ideal placement often yields the sharpest images during trolling or drifting.

Real-World Applications: From Offshore Fishing to Coastal Cruising

Anglers chasing trophy species in deep water love how this transducer's 600W power cuts through thermoclines, spotting suspended walleye or tuna amid bait balls. Coastal cruisers rely on its temperature data to navigate thermal breaks where predators lurk. Even recreational boaters appreciate the reliable bottom tracking for anchoring in unfamiliar bays.

In practice, expect superior performance over cheaper plastic transoms: tighter beam focus means fewer false readings from plankton or debris. Boaters report consistent 900-foot depths in clear conditions, dropping slightly in turbid water but still outperforming narrower-band alternatives.

Maintenance Tips for Longevity

• Clean regularly: Wipe the face with a soft cloth and marine-safe cleaner to remove growth—fouling can degrade signals by 20-30%.
• Winterize: Flush with freshwater if trailered, and inspect the O-ring seal annually.
• Monitor cable: Avoid chafing near bilge pumps; secure runs with zip ties.
• Software sync: Update your Garmin firmware for the latest CHIRP algorithms, enhancing resolution.

With proper care, this unit delivers years of trouble-free service, backed by Garmin's commitment to marine reliability.

Frequently Asked Questions