The Airmar DST820 is a next-generation Smart Multisensor thru-hull transducer that replaces the DST810, adding PSTI-compliant network security and QR-code Bluetooth pairing for a protected, hassle-free connection to Airmar's free CAST app. The Gen2 paddlewheel delivers class-leading speed-through-water accuracy from below 0.3 knots through 45 knots, while an integrated attitude sensor enables heel-compensated speed calibration across multiple heel angles and speed ranges — all managed wirelessly from a smartphone or tablet without expensive PC software.

Features:

• UK PSTI security compliance — QR-code setup with a one-time password protects the sensor on your NMEA 2000 network
• Gen2 paddlewheel provides start-up data below 0.3 knots, linear accuracy from 0.6 knots, and reliable readings to 45 knots
• 5.7 Hz (5× per second) speed output for smooth, high-resolution speed-through-water reporting
• Integrated attitude sensor supplies heel and trim data and supports advanced heel-compensated speed calibration
• Free CAST app (iOS/Android) enables basic and advanced calibration — including manual speed entries for multiple heel angles and up to 10 speed points — directly from a mobile device
• Depth tracking from 0.5 m (1.6 ft) to 100 m (328 ft)
• Measures depth, speed-through-water, water temperature, and vessel attitude

Specifications:

• Functions: Depth, Speed, Temperature, Attitude
• Mounting Style: Low-Profile Thru-Hull
• Power Rating: 80 W
• Protocol Output: NMEA 2000®
• Housing Material: Bronze
• Max Deadrise Angle: 22°
• Compatible Hull Material: Fiberglass or metal
• Required Hole Size: 51 mm (2")
• Retractable Housing: Yes
• Acoustic Window: Urethane
• Attitude Sensor: Yes
• Bluetooth: Yes — Bluetooth BLE
• Cable Length: 6 m (20 ft) NMEA 2000® cable
• Certifications: CE
• Common Use: Cruising/Racing Sailboats, Leisure/Yachting, Fishing
• Conventional Beam: 10° × 44°
• Data Rate: Depth — 1×/second; Speed — 5×/second; Heel/Trim — 10×/second
• Frequency: 235 kHz