The Airmar DX900+ Multilog Smart™ Electromagnetic Speed Sensor replaces paddlewheel technology with a no-moving-parts electromagnetic design that measures dual-axis speed through water and calculates leeway angle in real time. A 360° water-flow sensing field delivers transverse and longitudinal data with no latency, while corrosion-resistant alloy sensing pins provide stable, long-term readings. Wireless connectivity to Airmar's CAST™ app simplifies calibration and lets you display performance data on a phone or tablet. The low-profile thru-hull housing includes a water valve and retractable insert for safe removal, and the sensor also outputs heel, trim, and water temperature via NMEA 0183.

Specifications:

• Electromagnetic dual-axis speed measurement with no moving parts
• Measures transverse and longitudinal speed; instantaneously calculates leeway angle and speed through water with no latency
• Wireless connectivity via Airmar CAST™ app for performance display and calibration
• Outputs: heel, trim, speed, and water temperature
• Sensing pins made from high-quality corrosion-resistant alloy — do not apply bottom paint to exposed sensing pins
• Thru-hull, low-profile housing with water valve and retractable insert
• Available housing options: Plastic (P717V) or Stainless Steel (SS617V)
• Retrofits existing P617V housing
• Weight (sensor, box, and cable): Plastic — 1 kg (2.3 lb.); Stainless Steel — 2 kg (4.4 lb.)
• Hull Material Compatibility: Plastic housing for fiberglass or metal hulls; Stainless Steel housing compatible with all hull materials
• Deadrise Angle: Up to 22°
• Hole Diameter: Fiberglass or wood — 51 mm (2"); Stainless Steel housing in metal hull — 57 mm (2-1/4")
• Transverse Speed Range: ±6 knots
• Longitudinal Speed Range: ±60 knots
• Accuracy (Transverse and Longitudinal Speed): ±0.1 knots for speeds under 10 knots; ±1% for speeds above 10 knots
• Display Resolution: 0.01 knots
• Output Protocol: NMEA 0183 — speed and temperature
• Configurable Data Update Rate: Up to 10 Hz
• Operating Temperature Range: -15°C to 55°C (5°F to 131°F)
• Water Temperature Accuracy: ±0.5°C (±1.0°F)
• Supply Voltage: 9–16 VDC
• Average Power Consumption: 2.5 W (NMEA 0183)
• Standard Cable Length: 6 m (20 ft.) — NMEA 0183
• Includes: Blanking plug
• CE Compliant: Yes, to IEC 60945

Note: This product may not be returned to the original point of purchase. Please contact the manufacturer directly with any issues or concerns.

Resources:

• Product Brochure (PDF)
• Product Video