Fed up with cleaning that paddlewheel sensor  ? 

AIRMAR’s new Ultrasonic speed sensor just turned your maintenance time into more cruising time... and made your boat smarter too. Ultrasonic speed, depth and temperature (UDST800) in one single housing with no moving parts makes this sensor a high precision, low maintenance solution for power and sail boats of all types and sizes.


  • Ultrasonic Depth, Speed & Temperature in one housing
  • Precise readings at high speeds ideal for powerboats, cruising and sailing
  • Data Update Rate: up to 10 x per second
  • Advanced filtering & sampling rates for increased accuracy at all speeds
  • Adapts automatically to boat speed, water depth and water clarity keeping speed accuracy consistent
  • No moving parts – no paddlewheel


  • Correlation Speed Sensor Transmitting Frequency: 4.5 MHz
  • Correlation Pulse Repetition Frequency: 0.5 kHz to 12 kHz (varies with speed)
  • Speed Range: 0.1 to 50 knots (.1 MPH to 57 MPH)
  • Available Outputs: NMEA2000®
  • Water Temperature Range: -4°C to 40°C (32°F to 104°F)
  • Depth: 235 kHz
  • Depth Range: Minimum 0.6 m ( 2'), Maximum 100 m (328')
  • Supply Voltage—NMEA2000®: 9 VDC to 16 VDC
  • Supply Current: 80 mA - 200 mA, Average 125 mA @12VDC
  • Thru-Hull Housing Material: Plastic (bronze or stainless steel optional)
  • Thru-Hull Housing Diameter: 51 mm (2")
  • CE Compliant: Yes
  • Retrofits into AIRMAR P617V housing

Airmar Part 41-218-1-01


For sale by an authorised Airmar, Navico, Raymarine service dealer in the UK,    JG Technologies Ltd. Weymouth, Dorset UK

Airmar UDST800 Ultrasonic Smart™ Sensor NMEA2000 Part 44-218-1-01

  • Brands Airmar
  • Product Code: UDST800
  • Availability: In Stock
  • £1,049.00

  • Ex Tax: £874.17