Airmar DX900+ Transducer Electromagnetic Dual-Axis Speed

Overview

Who This Is For: Built for serious cruisers, racers, and performance sailors who need accurate speed and leeway data without the maintenance headaches of a paddlewheel. If you're logging long passages, racing competitively, or sailing in conditions where true boat performance matters, this sensor pays for itself in confidence and reliability.

Product Summary: The DX900+ replaces your paddlewheel with electromagnetic speed sensing that measures water flow in all directions — not just along your hull. No moving parts mean no fouling, no cleaning, and no downtime. You get true dual-axis speed data, instant leeway calculation, and water temperature, all fed directly to your chartplotter or navigation system via NMEA 0183.

Key Features

• Electromagnetic Dual-Axis Speed Measurement — reads both transverse and longitudinal speed simultaneously — you'll see exactly how much sideways set you're carrying, which paddlewheels can't measure at all.
• Zero Moving Parts — no paddlewheel to foul on kelp, debris, or marine growth — you won't be hauling the sensor up mid-passage to clean it.
• Instant Leeway Calculation — data streams to your instruments with no latency, so your nav system knows your true position relative to water flow in real time.
• Wireless CAST App Integration — calibrate and monitor performance data on your phone or tablet, eliminating the need for deck cables or complex topside control units.
• Heel and Trim Output — feeds dynamic motion data to your instruments so your system understands how your boat's attitude affects speed readings.
• High-Corrosion-Resistant Sensing Pins — precision alloy construction holds tight calibration and resists saltwater degradation far longer than standard stainless.
• Thru-Hull Installation with Water Valve — low-profile housing fits existing P617V holes; retractable insert allows safe hauling and storage without leaving your hull exposed.

Specs & What's Included

Compatibility: Outputs NMEA 0183 at configurable rates up to 10 Hz — works with any chartplotter, autopilot, or navigation instrument that accepts standard NMEA speed and temperature strings. Available in plastic housing (fiberglass or metal hulls) or stainless steel (compatible with all hull types). Retrofits directly to existing P617V transducer holes. Works with deadrise angles up to 22 degrees.

In the Box: Sensor unit, 20-foot NMEA 0183 cable, blanking plug, and wireless CAST app access for calibration. Transducer is the complete sensor — no additional components required to start taking data.