The Garmin GT21-TM is a versatile transom-mount transducer that combines powerful traditional sonar with CHIRP ClearVü™, providing you with razor-sharp images of fish, bottom, and structures directly under the boat. The transducer is designed to perform stably in deep water and harsh conditions and is an obvious choice for both recreational and serious anglers.
The traditional sonar operates at 50/200 kHz with 600 W, which provides solid depth performance and reliable fish arches, while the ClearVü CHIRP element at 500 W and 260/455 kHz delivers photo-like bottom images with a high level of detail. This combination makes it significantly easier to distinguish fish from structure, vegetation, and bottom conditions.
The GT21-TM has a built-in fast-response temperature sensor and is supplied as an 8-pin transducer with complete mounting hardware and installation instructions. It is designed for transom mounting with a deadrise angle from 0–70° and integrates seamlessly with compatible Garmin chartplotters.
Key features
Combined traditional sonar and ClearVü CHIRP in one transducer
600 W traditional sonar and 500 W ClearVü for high detail
Sharp fish arches and photo-like bottom images
Built-in fast temperature sensor
Transom mount – suitable for many boat types
