The Garmin Ultra High-Definition Scanning Sonar System (Part Number: 010-02055-00, GCV™ 20) is a high-resolution sonar black-box module designed to deliver ultra-clear underwater imaging to compatible Garmin chartplotters and multifunction displays. Powered by advanced high-frequency ClearVü and SideVü scanning technologies, this network module provides crisp, photo-like target resolution of fish, submerged structures, and bottom contours around and beneath the vessel. Built with three network ports for effortless plug-and-play expansion across the Garmin Marine Network, the compact and waterproof GCV 20 system enables seamless network sharing of sonar data, structure maps, and waypoint locations across multiple networked displays.
In the Box
- GCV 20 Sonar Black Box
- GT34UHD-TM transducer
- Transom mount
- Trolling motor mount
- Right-angle power cable
- Right-angle ethernet cable
- Mounting hardware
- Documentation
Redefine Scanning Sonar

Ultra High-Definition ClearVü Scanning
This sonar system provides brilliant image clarity of structure and fish below your boat at greater depths than other high-frequency scanning sonars by putting more power on targets via a downward-facing element.


Ultra High-Definition SideVü Scanning
See stunningly clear images of structure and fish off to the sides of your boat. This makes it easy to scout a fishing area quickly, because you can see everything the first time with such amazing clarity.




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