Garmin GDT43 Depth/Temp Thru Hull Transducer

The Garmin GDT43 Depth/Temp Thru Hull Transducer is the foundation of reliable fishfinding and navigation on the water. Whether you're running a saltwater charter, hunting structure in deep lakes, or navigating coastal shallows, this through-hull transducer delivers the real-time depth and water temperature data that separate productive days from wasted fuel. Designed for anglers and boaters who demand accuracy without compromise, the GDT43 integrates seamlessly with Garmin chartplotters and fishfinding systems to give you the situational awareness needed to locate fish and navigate confidently.

This through-hull transducer operates with precision engineering that marine professionals trust in commercial and recreational applications alike. The GDT43 is engineered to mount permanently below the waterline, transmitting sonar signals while simultaneously reporting accurate water temperature data—critical information for understanding fish behavior and seasonal patterns. Its robust construction handles the demands of saltwater environments and freshwater systems, withstanding corrosion and mechanical stress that would compromise lesser transducers. The compact 1.4 lb design minimizes hull impact while maintaining the signal strength and frequency stability required for dependable performance across varying water conditions and depths.

Serious anglers and commercial operators rely on the Garmin GDT43 because installation delivers immediate returns in fishing success and operational safety. The transducer pairs with Garmin ECHOMAP, STRIKER, and other compatible Garmin display units to create a complete sonar solution. Professional installers and seasoned DIYers appreciate the straightforward through-hull mounting design, though proper installation below the waterline—typically on the transom or hull bottom—requires careful placement to avoid prop wash and turbulence. Once positioned correctly, the GDT43 provides years of dependable depth and temperature reporting, making it an essential upgrade for any vessel serious about performance and precision.