

The Garmin GT20-TM is a transom-mount CHIRP DownVü transducer with a 500W power rating. It operates in the 455 kHz and 800 kHz bands.
This model also acts as a conventional 500W non-CHIRP transducer at 77 kHz and 200 kHz.
| Feature | Specification |
|---|---|
| Part Number | 010-01960-01 |
| DownVü CHIRP Frequency Bands | 435-475 kHz; 800-840 kHz |
| Non-CHIRP Frequencies | 77/200 kHz |
| Power Rating | 500W RMS CHIRP; 500W RMS non-CHIRP |
| Housing | Transom mount, for transom angles from 0-70° |
| Beam Width | 2.5°x53° @ 455kHz; 1.6°x29° @ 800kHz |
| Temperature Sensor | Integrated into transducer |
| Transducer Cable | 20 ft with Garmin blue 8-Pin connector |
| Hole Size | Holes needed for bolts, transducer cable |
| Weight | 360g (0.79 lb) |
| Overall Height | 52mm (2.0") |
| Overall Length | 150mm (5.9") |
| Hull Material | Any |