Unlock Crystal-Clear Underwater Insights with the Raymarine B258

Imagine gliding through open waters, your sonar painting a vivid picture of the seafloor, fish schools, and hidden structures below. The Raymarine B258 Bronze High Performance Thru-Hull Transducer with Fairing delivers that precision every time. Crafted from robust bronze, this 1000-watt powerhouse thrives in demanding marine environments, offering dual-frequency scanning that balances deep-water penetration with sharp, detailed imaging close to the hull.

Unlike basic transducers that struggle with noise or distortion, the B258's fairing block streamlines water flow over the unit, minimizing air bubbles and turbulence for consistently reliable readings—even at higher speeds. Boat owners swear by its ability to spot wrecks, bait balls, and bottom contours that others miss, making it a game-changer for serious anglers and navigators.

Standout Features for Superior Sonar Performance

• Dual-Frequency Powerhouse: Operates at 50 kHz for wide-area deep scans (up to elliptical 3° x 5° beam) and 200 kHz for pinpoint shallow-water detail (15° x 21° beam), ensuring versatility across depths.
• High-Power Output: 1000 watts RMS pushes signals farther and returns clearer echoes, ideal for offshore adventures or murky inlets.
• Integrated Temperature Sensor: Tracks water temp in real-time, helping you locate thermoclines where fish congregate.
• Bronze Construction: Corrosion-resistant for saltwater longevity, paired with a hydrodynamic fairing block that aligns perfectly with hull curves.
• Ready-to-Install Cable: 30-foot length with secure connector simplifies setup without extra splicing.

Seamless Compatibility with Raymarine Systems

This transducer shines brightest when paired with proven Raymarine echo sounders. It integrates effortlessly with DSM250 and DSM300 modules, SL Series displays like the SL755RC and SL1250, plus hsb2 Plus and HDFI series units. Whether upgrading an older setup or building a new one, the B258 slots in without compatibility headaches, unlocking full potential from your chartplotter or fishfinder.

Best suited for wood or fiberglass hulls, it mounts flush for minimal drag. Skip it on metal hulls to avoid interference—stick to these materials for peak results.

Why Boaters Choose the B258: Real-World Advantages

Performance isn't just specs on paper. Anglers report tighter target separation at 200 kHz, revealing individual fish in tight schools, while the low-frequency mode excels at mapping drop-offs over 1000 feet down. The fairing block reduces cavitation, keeping your screen clean during planing or rough seas—something flush-mount alternatives often can't match.

For navigators, the temp probe adds safety by alerting to sudden changes that signal weather shifts or gear malfunctions. It's not entry-level gear; it's for those who demand pro-grade sonar that pays for itself in bigger catches and safer passages.

Pro Tips for Installation and Maintenance

Installation Essentials: Dry-fit the fairing first to match your hull's deadrise angle (up to 25°). Drill precisely, bed with marine sealant, and route the cable away from engines or props to dodge interference. Aim for a downward-facing mount, at least 1/3 from keel to strake, for optimal beam spread.

Long-Term Care: Rinse with fresh water after saltwater exposure. Inspect the bronze face annually for marine growth—light sanding restores performance. Avoid antifouling paints on the active face to prevent signal dampening. With proper upkeep, expect years of trouble-free service.

Common Pitfall: Speed calibration post-install. Dial it in via your sounder menu for accurate bottom lock at various throttle settings.

Frequently Asked Questions