Airmar DST820 Bluetooth Smart Thru-Hull Sensor

The Airmar DST820 Bluetooth Smart Thru-Hull Sensor is the successor to the DST810, adding PSTI compliance for stronger onboard network security, secured through a QR-code setup that sets the sensor with a one-time password entered right on a phone. Inside runs Airmar's Gen2 paddlewheel, delivering real speed-through-water accuracy, picking up usable data at a crawl under 0.3 knots, tracking linearly from 0.6 knots onward, and holding steady output right up to 45 knots. That range covers everyone from a casual day sailor to a tactical racer fine-tuning sail trim, and for racers specifically, precise speed data feeds directly into VMG and target speed calculations for data-driven tactical calls.

Airmar's free CAST app pairs with the DST820 to bring speed calibration, once locked behind costly PC software, right onto a phone or tablet, with both basic and advanced calibration options depending on how deep an owner wants to go. Beyond speed, this sensor also reads depth and water temperature, updating at 5.7 Hz for responsive tracking, and an integrated attitude sensor adds further refinement to the readings. 235 kHz, Bluetooth connectivity, depth range 0.5-100m (1.6-328 ft), plastic thru-hull mount. Explore more marine transducers.

• PSTI-compliant, secured via QR-code setup and one-time password
• Gen2 paddlewheel, accurate from below 0.3 knots to 45 knots
• Free CAST app for smartphone-based speed calibration
• Combined speed, depth, and water temperature sensing at 5.7 Hz update rate
• The DST820 is fully compliant with UK PSTI security standards, ensuring that the connection between DST820 and a mobile device is secure