Garmin GT21-TM Transom Mount DownVu Transducer is a compact, dual-mode sonar solution designed for coastal and offshore anglers who want both traditional sonar and CHIRP ClearVü scanning in one unit.
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Traditional sonar frequencies: 50/200 kHz with 600 W power; beamwidths 40°/10°; maximum depth up to 1,500 ft.
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CHIRP ClearVü imaging: 260 kHz (245-275 kHz) and 455 kHz (445-465 kHz) with 500 W; beams 2.0°x51° @ 260 kHz and 1.4°x29° @ 455 kHz; maximum depth up to 1,000 ft.
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Transom mounting and compatibility: 0°–70° deadrise/transom angles; includes 8-pin transducer, mounting hardware, and installation instructions; 30 ft cable.
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Integrated sensors: built-in fast-response depth and temperature sensor for real-time environmental context.
With the GT21-TM, you get a complete view of the water column by pairing near-field traditional sonar with far-field CHIRP ClearVü imaging to help you locate fish and underwater structures more effectively. The built-in depth and temperature sensor adds context for smarter lure choice and fishing strategy, while straightforward installation ensures reliable performance on a wide range of boats.
| General |
| Frequency |
| Traditional |
50/200 |
| ClearVü CHIRP |
260 kHz (245-275 kHz) & 455 kHz (445-465 kHz) |
| Power |
| Traditional |
600 W |
| ClearVü |
500 W |
| Beamwidth |
| Traditional |
40°/10° |
| ClearVü |
2.0°x51° @ 260 kHz and 1.4°x29° @ 455 kHz |
| Maximum depth |
| Traditional |
1,500 ft |
| ClearVü |
1,000 ft. |
| Depth/Speed/Temperature |
Depth and Temperature |
| Number of pins |
8-pin |
| Cable length |
30 ft. |
| Supported deadrise/Transom angles |
0°-70° degree transom |
