Lowrance B285M Medium CHIRP Bronze Thru-Hull 9-Pin

The Lowrance B285M Medium CHIRP Bronze Thru-Hull 9-Pin transducer is purpose-built for serious anglers and boaters who demand reliable sonar performance in freshwater and light saltwater environments. This bronze transducer mounts permanently through your boat's hull, delivering consistent target identification and bottom mapping from the moment you leave the dock. Whether you're chasing bass in a lake or trolling coastal shallows, the B285M bridges affordability with professional-grade sonar technology that has earned trust among recreational and semi-professional fishing operations for years.

The B285M operates on CHIRP (Compressed High Intensity Radar Pulse) technology, which transmits a continuous sweep of frequencies rather than a single tone—dramatically improving target separation and reducing noise interference in congested water columns. Its medium-frequency design strikes a practical balance between depth penetration and high-resolution detail, making it effective from shallow spawning flats to depths approaching 1,200 feet in optimal conditions. The 9-pin connector integrates seamlessly with Lowrance legacy systems and newer models alike, while bronze construction resists corrosion in saltwater splash and brackish conditions. This transducer's fixed-frequency approach eliminates complexity, so you spend less time troubleshooting and more time reading structure.

The Lowrance B285M is ideal for anglers upgrading older systems or retrofitting modest center consoles and open boats where cost and proven reliability matter most. Thru-hull installation requires a small hole (check your specific Lowrance head unit specs for exact size) and provides superior stability compared to transom-mounted alternatives—critical when trolling or anchoring in chop. Verify 9-pin compatibility with your existing or planned Lowrance chartplotter before ordering; this transducer does not work with modern Lowrance NMEA 2000 or Ethernet systems. Once installed, the B285M delivers years of dependable sonar without the maintenance demands of older single-frequency units.