Garmin Airmar DST820 Smart Transducer

The Garmin AIRMAR DST820 is a plastic thru-hull NMEA 2000 smart multisensor that brings depth, speed through water, water temperature and boat attitude together in a single low-profile housing. It is the next evolution of Airmar's industry-leading technology, replacing the DST810 and introducing UK PSTI compliance for enhanced onboard network security via secure QR-code Bluetooth pairing.

It can read depths to 100 m (330 ft) and offers fast 5 Hz water speed signal output for smoother visualisation on compatible chartplotters or other displays. At its heart is Airmar's Gen2 paddlewheel, which delivers start-up speed from as low as 0.3 knots, becomes linear at 0.6 knots and stays accurate up to 45 knots. An integrated attitude sensor adds heel/trim and pitch/roll data, while Bluetooth Low Energy connectivity links the sensor to the free Airmar CAST app for intuitive, heel-compensated speed calibration. The 235 kHz frequency helps prevent interference with other onboard echosounders, and the wide 10 x 44 degree beam holds bottom lock even on steep deadrise hulls and heeling sailboats. The low-profile plastic housing incorporates a self-closing valve and fits hull deadrise up to 22 degrees.