Upgrade your vessel's sonar capabilities with the precision-engineered Raymarine B175M Bronze 1kW CHIRP transducer featuring a 20° tilt. Crafted for serious anglers chasing trophy fish in demanding coastal and offshore environments, this low-profile thru-hull mount delivers unmatched clarity and target separation. Its bronze housing withstands the harshest saltwater conditions, ensuring long-term reliability whether you're running a center console or a larger sportfisher.

Why Choose the B175M for Superior Fishfinding

The B175M stands out in the world of marine transducers by harnessing CHIRP technology across a medium-frequency range of 85-135 kHz. Unlike traditional fixed-frequency sonar that sends a single pulse, CHIRP sweeps continuously through frequencies, producing razor-sharp images of fish, structure, and bottom contours. This results in exceptional resolution at depths up to 1,500 feet, making it ideal for spotting game fish holding near wrecks, drop-offs, or schools of bait in mid-water columns.

With a powerful 1kW output and a beam width that adjusts from 24° to 16° to match your hull's deadrise angle (16° to 24°), installation becomes straightforward for boats with moderate V-hulls. The 20° tilted element aligns perfectly with the water flow, minimizing turbulence and air entrainment that can plague flat-mounted units at high speeds. Anglers report crystal-clear arches on schools of snapper, grouper, or pelagics, even in choppy seas.

Key Performance Advantages in Real-World Fishing

• Deep-Water Precision: Excels at revealing bottom structure and suspended fish with minimal noise, thanks to its broadband CHIRP bandwidth—up to 50 kHz total for vivid detail.
• High-Speed Stability: Low-profile design (3.75-inch diameter) hugs the hull, maintaining consistent performance above 30 knots without cavitation.
• Temperature Sensing: Integrated thermistor provides accurate water temperature readings to track thermoclines and bait migrations.
• Versatile Coverage: Medium CHIRP band strikes the perfect balance between deep penetration and fine target ID, outperforming narrow high-frequency options in varied depths.
• Durable Construction: Bronze thru-hull penetrates fiberglass or wood hulls securely, with a 33-foot cable for flexible routing to your display.

Installation Insights for Optimal Results

Mounting a thru-hull transducer like the B175M rewards careful planning. Position it forward of the propeller and keel line, at least 1/3 of the waterline length from the bow, to avoid interference. Fair it flush with marine sealant for hydrodynamic efficiency. Pair it with compatible Raymarine multifunction displays for seamless integration—users love how it enhances SideVision and DownVision modes for 360° awareness.

Pro tip: In variable deadrise hulls, the 20° tilt compensates for angles up to 24°, reducing dead zones and improving bottom tracking. Regular maintenance, like annual cleaning of the face with a soft brush and non-abrasive cleaner, keeps it performing like new amid biofouling threats.

Fishing Scenarios Where It Shines

Picture this: You're drifting over a deep reef edge, and the screen lights up with individual fish separated from the clutter— that's the B175M at work. Tournament pros favor it for its ability to mark subtle ledges and bait balls that traditional sonar misses. Coastal charters use it to nail flounder on flats or tuna pushes in the bluewater, where every detail counts for limiting out.

Its wide effective coverage means less time searching and more time hooking up, boosting your success rate without needing multiple transducers.

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