The Garmin GT8HW-IH is Garmin's first high-frequency CHIRP in-hull transducer, designed for boats where maximum stability, low drag, and reliable depth readings at high speeds are essential. When properly mounted on the inside of a fiberglass hull, it takes advantage of the clean water flow under the hull, providing an exceptionally stable and clear sonar display – even at high speed.
The transducer uses High Wide CHIRP sonar, which delivers wide, distinct fish arches and solid bottom definition in shallow to medium-depth water. With a transmit power of 250 W and a beam angle of up to 24°, it achieves a large coverage area, ideal for precise fish searching without the need for transom mounting.
The GT8HW-IH is particularly well-suited for high-speed boats where traditional transom transducers may lose signal due to cavitation. It can also be combined with a transom-mounted Garmin GT30-TM via a Y-adapter cable, allowing you to maintain reliable depth readings at high speed while simultaneously getting ClearVü/SideVü scanning at trolling speed.
Key features
Garmin's first high-frequency CHIRP in-hull transducer
Stable sonar display even at high speed
High Wide CHIRP – wide fish arches and large coverage area
Perfect for shallow and medium-depth freshwater
Ideal for boats where transom mounting is not optimal
Can be combined with GT30-TM for scanning sonar at low speed
