DST820 NMEA 2000 Thru-Hull Smart Multisensor Transducer

The DST820, equipped with Airmar's advanced Gen2 paddlewheel technology, delivers exceptional speed-through-water accuracy—offering precise initialization data below 0.3 knots, consistent linear accuracy from 0.6 knots, and dependable performance up to 45 knots.

For day sailors, weekend cruisers, and competitive racers alike, accurate speed-through-water (STW) measurements are essential for optimizing sail configuration and rig equilibrium to achieve peak performance. Racing competitors benefit particularly from precise STW data, which facilitates accurate velocity made good (VMG) and target speed computations on racing instruments, thereby ensuring all tactical decisions are grounded in reliable data.

The DST820 and Airmar's CAST™ application streamline speed calibration procedures significantly. The complimentary CAST application offers sophisticated calibration capabilities—previously accessible only through expensive PC-based solutions—now readily available via smartphone or tablet. Users may select between fundamental or comprehensive calibration methodologies according to their requirements.

In addition to speed measurement, the DST820 determines depth and water temperature while delivering a 5.7 Hz (5× per second) speed output with enhanced precision. Its built-in attitude sensor furnishes heel and trim information, facilitating heel-compensated speed calibration across varying heel angles and speed ranges—a process that is efficient, straightforward, and entirely independent of existing onboard systems.

With depth measurement capabilities spanning 0.5 m (1.6 ft) to 100 m (328 ft), the DST820 furnishes trustworthy depth information to mitigate grounding risks.

The DST820 integrates seamlessly with Raymarine i50, i60, i70, and Alpha instrument systems, as well as Axiom and Axiom 2 chartplotters. The transducer incorporates a standard NMEA 2000 DeviceNet Micro-C connector and may be adapted for SeaTalk NG compatibility through adapter cable A06079, available for separate purchase.

• All-in-one depth, speed through water, and water temperature
• Integrated heel-and-trim (attitude) data
• High-resolution speed output with improved update rate
• Simple NMEA 2000 network connectivity
• Wireless calibration and configuration using the Airmar CAST app
• PSTI-compliant for cybersecurity

Specifications:
• Functions: Depth, Speed, Temperature, Attitude
• Mounting Style: Low Profile Thru-Hull
• Power Rating: 80 W
• Protocol Output: NMEA 2000®
• Housing: Plastic
• Max Deadrise Angle: 22°
• Hull Material: Fiberglass or metal
• Hole Size: 51 mm (2")
• Retractable housing: Yes
• Acoustic Window: Urethane
• Attitude Sensor: Yes
• Bluetooth BLE
• Cable-Length: 6 m (20') NMEA 2000® cable
• Certifications: CE
• Common Use: Cruising/Racing Sailboats, Leisure/Yachting, Fishing
• Conventional Beam: 10°x44°
• Data Rate: Depth: 1X/second, Speed: 5X/second, Heel/Trim: 10X/second
• Max Deadrise: Up to 22°
• Max Depth: 0.5 m (1.6') to 100 m (330')
• Minimum Depth: 0.5 m (1.6')
• NMEA 2000 LEN: 2
• Pulses: 20,000 p/nm* (5.6 Hz per knot)—*p/nm = pulses per nautical mile
• Retrofits: Fits most Airmar 2" housings
• Speed Range: Up to 45 knots
• Temperature Accuracy: ±0.5°C (±1.8°F)
• Tilted Element: No
• Usable Shaft Length: 121 mm (4.75")
• Voltage: 9 to 16 VDC
• Water Temperature: -10° to 40°C (14° to 104°F)
• Weight: 1.6 kg (3.5 lbs.)