Airmar UDST820 TriSonic Plastic Thru-Hull Transducer - N2K [UDST820P-N2]
Airmar UDST820 TriSonic Plastic Thru-Hull Transducer - N2K [UDST820P-N2]
UDST820 TriSonic Plastic Thru-Hull Transducer - N2K: TriSonic Smart Sensor combines a depth sensor, ultrasonic speed sensor, water temperature, and heel and trim data into one sensor. It delivers unmatched reliability and accuracy without the need for paddlewheel maintenance.
In stock — ships today if ordered by 2 PM ET
About the transducer.
UDST820 TriSonic Plastic Thru-Hull Transducer - N2K: TriSonic Smart Sensor combines a depth sensor, ultrasonic speed sensor, water temperature, and heel and trim data into one sensor. It delivers unmatched reliability and accuracy without the need for paddlewheel maintenance. Its ultrasonic speed solution features no moving parts, eliminating cleaning or wear concerns, making it a high-precision, low-maintenance option for power and sailboats of all sizes. The TriSonic Smart Sensor, along with the CAST™ app, simplifies the calibration of speed-through-water. The Airmar CAST™ App connects directly from iOS and Android™ Smart devices to Airmar’s Bluetooth® enabled TriSonic Smart™ sensors and makes configuration simple with intuitive menus and guided calibration. View data from the sensor in digital or graphical format, quickly turn on or off NMEA 2000® PGNs, configure offsets and more. CAST App for Speed and Depth Calibration:: The CAST app provides a simple and consistent way of calibrating speed and depth. Simple offsets can be applied to compensate for the depth below keel or depth from surface. Calibrations and configuration changes are stored in the Airmar Smart Multisensor and delivered to the NMEA2000® network. CAST provides a consistent and reliable way to calibrate basic and heel-compensated speed-through-water with a step-by-step guided process. For advanced speed-through-water calibration, CAST allows you to manually enter custom speed data for up to four heel angles and up to ten speeds. Before CAST, this feature was only available on the market through expensive PC software. Embrace Ultrasonic Smart technology and leave paddlewheel maintenance behind, brought to you by the innovators of the Smart™ Sensor. TriSonic Smart Sensor Combines:: Features:: Connects wirelessly to Airmar’s CAST app, offering user-friendly benefits:: Specifications::
- Ultrasonic speed (no paddlewheel)
- Depth
- Water temperature
- Heel and trim data
- No paddlewheel or moving parts to maintain or replace.
- Provides NMEA 2000® output of calibrated data to every instrument and MFD on the network.
Product specifications
Full specifications are being added. Call the Field Desk at (704) 709-5290 for details on this item.
Ultrasonic speed (no paddlewheel)
Engineered and field-tested with Airmar. Airmar gear, chosen and stocked by the Bucks & Bass Field Desk.
Depth
Engineered and field-tested with Airmar. Airmar gear, chosen and stocked by the Bucks & Bass Field Desk.
Water temperature
Engineered and field-tested with Airmar. Airmar gear, chosen and stocked by the Bucks & Bass Field Desk.
Fit notes
Runs true to size with room for a midweight layer underneath. If you are between sizes and plan to layer heavily, size up. Field Desk staff can confirm fit by phone or chat before you order.
Size chart
| Size | Chest | Waist | Sleeve |
|---|---|---|---|
| S | 35–37 | 29–31 | 32.5 |
| M | 38–40 | 32–34 | 33.5 |
| L | 41–43 | 35–37 | 34.5 |
| XL | 44–46 | 38–40 | 35.5 |
| 2XL | 47–49 | 41–43 | 36.5 |
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“Exactly as described. Quiet, well built and the fit is right. Second season with it and no complaints.”
Mark T.Verified buyer • Whitetail“Bought this on a Field Desk recommendation and it was the right call. Shipping was fast.”
Jenna R.Verified buyer • Weekend trips“Solid gear for the money. Would like one more color option but performance is there.”
Cody B.Verified buyer • BassFree standard shipping
Orders over $75 ship free in 3–5 business days. Orders placed before 2 PM ET ship the same day.
Easy 30-day returns
Unused gear in original packaging can be returned within 30 days for a full refund. We email a prepaid label.
Warranty handled for you
Full Airmar manufacturer warranty. Our Warranty Center manages the claim so you do not have to chase the brand.
Recommended with it.
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Add the two most-paired items and save 10%.
Airmar UDST820 TriSonic Plastic Thru-Hull Transducer - N2K [UDST820P-N2] + Furuno 520-IHD Plastic In-Hull Transducer, 600w (10-Pin) [520-IHD] + Furuno 525T-BSD Bronze Thru-Hull Transducer w/Temp, 600W (10-Pin) [525T-BSD]


