Garmin GT21-TM Transducer – Part No. 010-01962-00 

The Garmin GT21-TM is a transom-mount transducer designed to provide reliable readings of the seabed and underwater structures. It is ideal for coastal fishing and for boaters looking to improve the performance of a compatible Garmin fishfinder.
It combines traditional CHIRP sonar with ClearVü technology, delivering detailed images of fish, wrecks, vegetation and bottom contours beneath the boat. This dual-sonar setup provides effective target separation together with a clearer view of underwater structures.
Designed for transom mounting, the GT21-TM is a practical and robust solution for fishing and recreational boats that require a reliable, easy-to-install transducer.