Airmar B285M Transducer CHIRP Thru-Hull

Overview

Built for serious anglers running 25-foot boats and larger who need a workhorse thru-hull transducer that handles everything from shallow structure to 1,500 feet of water. If you're fishing mid-depth lakes and coastal waters where you need clean target separation and reliable bottom detail, this is your transducer.

The B285M is a medium-frequency CHIRP transducer that gives you the flexibility to toggle between wide and narrow beam spreads on a single channel sounder. You get 50 kHz of bandwidth (85–135 kHz) covering popular fishing frequencies like 88 and 107 kHz, plus exceptional performance in the mid-range depths where most fish actually live. The high-performance fairing keeps data clean even at speeds over 30 knots.

Key Features

• Medium Frequency CHIRP (85–135 kHz) — covers 50 kHz of total bandwidth with beamwidth from 16° to 11° — lets you create presets to toggle between wide coverage for scouting and narrow beams for pinpointing structure without changing transducers.
• 1 kW Power with 1,500-Foot Maximum Depth — enough punch to see fish and structure in mid to deeper water while maintaining clean target resolution.
• Integrated Temperature Sensor — reads fast-response water temperature so you can correlate bites with water conditions on the fly.
• High-Performance Fairing — improves broadband performance above 30 knots, keeping your sonar data stable and readable at cruise speed.
• Bronze Housing — rated for both planing and displacement hulls in fiberglass or wood construction, built to last in saltwater or freshwater.
• Xducer ID Technology — automatic transducer recognition eliminates manual setup headaches when you swap units or troubleshoot on the water.

Specs & What's Included

Compatibility: This is a thru-hull transducer requiring a Mix & Match cable (sold separately) to integrate with your sounder. The B285M works with any CHIRP-capable single-channel sounder that accepts Airmar transducers. Not sure if this works with your setup? Call or text us at (833) 831-4077 — we'll tell you straight.

In the Box: Airmar B285M thru-hull transducer with bronze housing and high-performance fairing. Transducer cable purchased separately.