Garmin GT51M-THP is a professional through-hull transducer pair designed for boats where extra high demands are placed on sonar performance in deep water and harsh conditions. The set consists of separate port and starboard transducers, which together deliver extremely detailed images of fish, bottom structures, and objects under and around the boat.
The GT51M-THP combines traditional mid-band CHIRP sonar with CHIRP ClearVü™ and SideVü™, providing both precise depth readings and broad structural scanning. The ClearVü/SideVü elements provide 500 W per element (1,500 W total) at 260 and 455 kHz, while the traditional CHIRP sonar delivers 600 W in 80–160 kHz, ideal for deep water and high speeds.
The two through-hull transducers with stainless steel stems are mounted on each side of the hull and are optimized for boats with hull deadrise up to 25°. The result is more stable signals, fewer shadows, and maximum image quality – even in demanding sea conditions. A fast-response temperature sensor is built-in, providing precise water temperature data directly to your compatible Garmin plotter.
Key features
Transducer pair (port/starboard) for optimal SideVü coverage
Traditional mid-band CHIRP sonar for deep water
CHIRP ClearVü™ and SideVü™ for high-resolution structure and fish scanning
High total transmit power – up to 1,500 W ClearVü/SideVü
Stainless steel stems and fairing blocks for stable through-hull mounting
Built-in fast-response temperature sensor
Suitable for boats with hull deadrise up to 25°
