Garmin GST™ 43 Thru-Hull Speed/Temperature Transducer

The Garmin GST 43 Thru-Hull Speed/Temperature Transducer is a dual-function marine instrument that reads water speed and temperature simultaneously, transmitting data to compatible Garmin chartplotters and instrument displays via NMEA 2000 network integration. This thru-hull transducer is engineered for boaters who need accurate real-time water conditions without installing separate speed and temperature sensors.

The GST 43 retrofits directly into existing Nexus 43mm thru-hull transducer installations (TH43 compatibility), eliminating the need for new hull penetrations. When paired with the GST 10 converter, the unit connects seamlessly to NMEA 2000 networks, allowing speed and temperature data to display across multiple screens throughout your vessel. This consolidated approach reduces installation complexity and delivers cleaner, more organized helm information—critical for navigation accuracy and engine performance monitoring.

Weekend anglers and serious offshore fishermen alike rely on water temperature data for locating thermoclines and seasonal fish movements, while speed readings are essential for fuel economy calculation, drift management, and electronic chart alignment. The GST 43 delivers both metrics to a single sensor interface, reducing clutter on the hull and simplifying wiring runs. This transducer supports the growing ecosystem of Garmin marine electronics designed for modern sport fishing, commercial operation, and cruising vessels that demand precision instrumentation integrated into digital navigation systems.