Airmar UDST800 Smart Transducer NMEA 2000 Ultrasonic

Overview

Built for cruising sailors, serious powerboat anglers, and anyone running NMEA 2000 who wants depth, speed, and temperature data without the headache of moving parts. If you're tired of cleaning paddlewheel sensors and want rock-solid readings from 0.1 to 50 knots, this is your transducer.

The UDST800 packs three functions into a single low-profile thru-hull with zero maintenance. Ultrasonic sensing means no paddlewheel to snag or foul—just clean, adaptive data that adjusts automatically to your boat speed, water depth, and clarity. It's the difference between guessing your speed and knowing it precisely, especially when you're running hard or fishing shallow.

Key Features

• Ultrasonic Speed, Depth, and Temperature — no moving parts, no paddlewheel maintenance — you'll spend your time fishing instead of scrubbing sensors.
• Adaptive Smart Sensor Technology — automatically adjusts filtering and sampling to match your boat speed, water depth, and clarity — accurate readings whether you're trolling at 1 knot or running 40 knots to the next bite.
• Single Low-Profile Thru-Hull Housing — fits existing Airmar P617V, B617V, or SS617V holes without extra installation work — retrofit into bronze or stainless steel housings if you upgrade later.
• 235 kHz Frequency — prevents interference with other sonars on your boat — especially important if you're running multiple echo sounders or a full suite of electronics.
• Retractable Plastic Insert with Water Valve — protects the sensor when hauled out and simplifies servicing — one less thing to worry about between trips.
• 10 Data Updates Per Second — fastest refresh rate in its class — critical for accurate speed and temperature data when conditions change fast.
• NMEA 2000 Output — integrates seamlessly into networked systems — one cable connection to your entire electronics backbone.

Specs & What's Included

Compatibility: This transducer retrofits into Airmar P617V, B617V, or SS617V housings. It outputs NMEA 2000 and requires a compatible network (most modern integrated systems support this standard). Operates on 9–16 VDC. Not sure if this works with your setup? Call or text us at (833) 831-4077 — we'll tell you straight.

In the Box: UDST800 Smart transducer with retractable housing, 20-foot NMEA 2000 cable, and mounting hardware. Installation into thru-hull housing is required; the housing itself is sold separately if you don't already have a compatible Airmar mount.

Performance Range: Depth 0.6 m to 100 m (2' to 330'), speed 0.1 to 50 knots, temperature –10° to 40°C (14° to 104°F) with ±0.5°C (±1.8°F) accuracy. 57 mm usable shaft length; 51 mm hole size for fiberglass/metal hulls (57 mm for stainless steel in metal hulls). Weight 1.4 kg (3 lbs).