Garmin GT21-TH CHIRP/DownVu Xdcr New Condition 010-01962-10. Features of Garmin GT21-TH CHIRP/DownVu Xdcr: Frequency: Traditional 50/200; Cleave CHIRP 260 kHz Power: Traditional 600 W; Cleave 500 W Beam width: Traditional Included Accessories: GT21-TH...