Airmar UDST800 Ultrasonic Smart Sensor

This through-hull multisensor has no moving parts and requires zero maintenance.

Product Information

The Airmar UDST800 Ultrasonic Smart Sensor can tell you how fast the boat’s moving, how deep the water is, and what the water temperature is, with zero moving parts. Eliminating the paddle wheel of old-style speedos means you don’t have to keep up with maintenance, and thanks to ultrasonic sensing with adaptive signal processing and a data update rate of 10 times per second, you’ll get über-accurate info at every glance. This is a single housing and retrofits Airmar P617V, B617V and SS617V housings, for easy installations.

Contact: airmar​.com


  • Weight:
    Plastic: 1.4 kg (3 lb.)
    Bronze: 1.8 kg (4 lb.)
    Stainless Steel: 1.7 kg (3.7 lb.)
  • Hull Material:
    Plastic: Fiberglass or metal
    Bronze: Fiberglass or wood
    Stainless Steel: Compatible with all hull materials
  • Deadrise Angle: Best performance through 7°. Accommodates up to 22°
  • Hole Diameter:
    All Hull Materials: 51 mm or 2"
    Stainless Steel Housing in a Metal Hull: 57 mm or 2-1/4"
  • Acoustic Window: Urethane
  • Frequency: 235 kHz
  • Depth Range: 0.6 to 100 m (2 to 328')
  • Speed:
    Range: 0.1 to 50 knots (0.1 to 57 MPH)
    Transmitting Frequency: 4.5 MHz
  • Water Temperature:
    Range: -10 to 40°C (14 to 104°F)
    Accuracy: ±0.5°C (±1.8°F)
  • Data:
    Output Protocol: NMEA 2000®
    Update Rate: Up to 10 times/s
  • Power:
    Supply Voltage: 9 to 16 VDC
    Supply Current: 80 to 200 mA. Average 125 mA at 12VDC
  • Cable Length: 6 m (20')
  • Includes: Ultrasonic Processor and blanking plug
  • Certification and Standards: CE, IEC60945