Raymarine ST900 Speed/Temp Low Profile Plastic Thru-Hull with 20m Cable

The Raymarine ST900 Speed/Temp Low Profile Plastic Thru-Hull with 20m Cable is purpose-built for serious anglers and boaters who demand real-time water data at their helm. This transducer delivers dual functionality—accurate speed and fast-response temperature readings—in a compact, low-profile housing designed for minimal drag and clean installation on any hull type. Whether you're running offshore, navigating inland waters, or fine-tuning your approach to structure, reliable speed and water temperature data are non-negotiable for modern boating and fishing.

Built on Raymarine's proven sensor technology, the ST900 measures speed across a best-in-class range of 0.3 to 45 knots (0.34 to 52 MPH / 0.55 to 83 KPH), delivering precision from drift-fishing crawls to full-throttle cruising. The fast-response temperature sensor captures thermocline shifts and water-column changes instantly—critical for locating active fish and adjusting tactics on the water. The low-profile plastic housing reduces turbulence and transducer-induced noise, while the retractable insert simplifies maintenance and cleaning without removing the entire unit. Analog output integrates seamlessly with Raymarine chartplotters, multifunction displays, and autopilot systems, and the included 20-meter cable provides flexible installation options for boats of all configurations.

This transducer suits both recreational and professional operators running Raymarine systems—from fishing guides who rely on temperature data to spot thermal structure, to cruising sailors monitoring speed for fuel optimization and ETA calculation. The thru-hull design works on fiberglass, aluminum, and composite hulls, and the compact profile fits tight mounting locations where traditional speed sensors won't fit. Proper sealing and cable routing during installation ensure years of dependable operation and accurate readings in all sea states. For boaters seeking OEM-grade speed and temperature integration at the chart table, the ST900 remains a trusted, field-proven choice.