The Airmar UDST800 combines ultrasonic speed, depth, and water temperature sensing into a single low-profile thru-hull housing with no moving parts. Built on Airmar's patented Smart™ technology, this NMEA 2000 transducer eliminates paddlewheel maintenance while delivering precise, fast-response data across a wide range of speeds and conditions. Advanced filtering and adaptive sampling keep readings consistent whether you're power cruising, racing, or fishing offshore.

Features:

• Ultrasonic speed, depth, and fast-response water temperature in one housing
• No moving parts — no paddlewheel to foul or maintain
• Accurate readings at high speeds, suited for powerboats, cruising sailboats, and racing
• Advanced filtering and adaptive sampling rates improve accuracy at all speeds
• Automatically adjusts to boat speed, water depth, and water clarity for consistent speed accuracy
• 235 kHz operating frequency minimizes interference with other echosounders aboard
• Retractable plastic insert in a low-profile plastic housing with integrated water valve
• Also available in bronze (B617V) or stainless steel (SS617V) housing configurations
• Retrofits into Airmar P617V, B617V, or SS617V housings
• Powered by Airmar's Smart™ Sensor technology

Specifications:

• Functions: Depth, Speed, Temperature
• Mounting Style: Low Profile Thru-Hull
• Power Rating: N/A
• Protocol Output: NMEA 2000®
• Housing: Plastic
• Hull Material Compatibility: Fiberglass or metal
• Hole Size: 51 mm (2"); stainless steel housing in metal hull — 57 mm (2-1/4")
• Retractable Housing: Yes
• Acoustic Window: Urethane
• Cable Length: 6 m (20') NMEA 2000® cable
• Common Use: Cruising/Racing Sailboats, Leisure/Yachting, Fishing
• Data Rate: Up to 10 times per second
• Max Depth Range: 0.6 m (2') to 100 m (330')
• NMEA 2000 LEN: 8
• Retrofits: Airmar P617V
• Speed Range: 0.1 to 50 knots (0.1 to 57 MPH)
• Temperature Accuracy: ±0.5°C (±1.8°F)
• Tilted Element: No
• Usable Shaft Length: 57 mm (2.25")
• Voltage: 9 to 16 VDC
• Water Temperature Range: -10° to 40°C (14° to 104°F)
• Weight: 1.4 kg (3 lbs)

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

Resources:

• Installation Guide (PDF)
• Product Brochure (PDF)