Garmin GCV 20 Ultra HD Scanning Sonar Black Box w/GT34UHD-TM Ultra HD Transom Mount Transducer

The Garmin GCV 20 bundle adds Ultra HD scanning sonar to a compatible Garmin network, combining the GCV 20 black box with a GT34UHD-TM transom transducer. It provides UHD ClearVü and UHD SideVü for anglers who want a sharper view of bottom structure beside and beneath the boat. This is a network sonar system, so a compatible GPSMAP or ECHOMAP display is still required.

ClearVü operates at 800kHz with a listed 200-foot range, while SideVü uses 1,200kHz and reaches 125 feet on each side. That high-frequency design is aimed at detail and structure definition in relatively shallow water. Three Garmin Marine Network ports also act as a built-in network expander, which helps when several displays or modules share the system. The included GT34UHD-TM makes this bundle more complete than the GCV 20 module-only version.

Key Features

- UHD ClearVü at 800kHz – Provides detailed downward scanning with a listed 200-foot range.
- UHD SideVü at 1,200kHz – Shows structure up to 125 feet on each side.
- GT34UHD-TM transducer included – Supplies the transducer needed for the listed scanning sonar.
- Three Garmin Marine Network ports – Adds network expansion for compatible Garmin equipment.
- GPSMAP and ECHOMAP compatibility – Fits listed Garmin display families.

Who Is This For?

This Garmin UHD scanning sonar bundle suits freshwater and coastal fishing boats that already use a compatible Garmin MFD. It is not ideal for buyers without a Garmin display or for deep-water anglers expecting long-range sonar from high-frequency SideVü; the transducer and water conditions limit practical range.

Compatibility

Confirmed compatibility includes Garmin GPSMAP 7×2/9×2/12×2 and ECHOMAP Plus, UHD, and Ultra units, the GT34UHD-TM transducer, and three Garmin Marine Network ports. The supplied information does not identify NMEA 2000, NMEA 0183, radar, autopilot, Raymarine, Simrad, or Lowrance compatibility. No named incompatible system was provided.

Technical Specifications

- Brand: Garmin
- Model: GCV 20 Bundle, 010-02055-01
- Transducer: GT34UHD-TM Ultra High-Definition transom mount
- Sonar: UHD ClearVü and UHD SideVü
- Frequencies: 800kHz ClearVü; 1,200kHz SideVü
- Range: 200 feet ClearVü; 125 feet each side SideVü
- Networking: Three Garmin Marine Network ports
- Compatibility: GPSMAP 7×2/9×2/12×2, ECHOMAP Plus/UHD/Ultra
- Display: Not included
- Warranty: 1-year limited warranty

Warranty & Support

Garmin provides a 1-year limited warranty. The supplied specifications do not state warranty exclusions or service procedures.

The GCV 20 bundle is the practical Garmin choice when the boat needs UHD ClearVü and SideVü with the transducer included. Compared with the module-only version, it removes one major sourcing step. The trade-off is the high-frequency range: it gives excellent structure detail, but it is not the right tool for maximum deep-water coverage. Choose it for detailed scanning around the boat.