Garmin GT21-TM Chirp/DownVu Xdcr GT21-TM Chirp/DownVu Xdcr. This transom mount transducer consistently displays clear and crisp fish arches with superior target separation as well as clear definition of structure below the boat. This item is in the category "Sporting Goods\Fishing\Fishfinders". The seller is "bitshopus" and is located in this country: US. This item can be shipped to United States.