The Garmin GT20-TM packs DownVü and traditional sonar into a single transom-mount transducer, giving you CHIRP 455/800 kHz imaging alongside dual-frequency 77/200 kHz conventional sonar — all through one 8-pin connection. A fast-response temperature sensor is built in, and the unit reads bottom structure, fish arches, and suspended targets from shallow water down to nearly 2,000 feet on traditional frequencies.

Specifications:

• Transducer type: Transom mount (DownVü + Traditional)
• Connector: 8-pin
• Cable length: 20 ft
• Power rating: 500 W
• Traditional sonar frequencies: 77/200 kHz
• DownVü sonar frequencies: CHIRP 455/800 kHz
• Maximum depth — traditional sonar: 1,900 ft
• Maximum depth — DownVü: 750 ft
• Transom angle range: 0° to 70°
• Built-in temperature sensor: Yes (fast response)
• Includes: Transom mount, trolling motor mount, and installation instructions

⚠️ California Prop 65 Warning: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.