The Garmin GCV 20 Ultra HD Scanning Sonar Black Box pairs with the GT34UHD-TM Ultra HD Transom Mount Transducer to bring Ultra High-Definition ClearVü and SideVü scanning sonar to any compatible Garmin chartplotter. Operating across frequencies from 0.8 MHz (800 kHz) to 1.2 MHz (1,200 kHz), the system delivers exceptional image clarity of structure and fish both below and to the sides of your boat. The GCV 20 is networkable across multiple chartplotters and supports Panoptix all-seeing sonar sharing, while the GT34UHD-TM transducer mounts at the transom with a three-array design — including a dedicated downward-facing element — for maximum resolution at depth.

GCV 20 Black Box — General Specifications:

• Physical dimensions: 9.9" × 7.6" × 2.6" (251 mm × 192 mm × 66 mm)
• Weight: 1.86 lbs (845 g)
• Water rating: IPX7
• Garmin Marine Network ports: 3
• Operating temperature range: 5°F to 158°F (-15°C to 70°C)

GCV 20 Black Box — Sonar Features & Specifications:

• Ultra High-Definition ClearVü frequency: 0.8 MHz (800 kHz), CHIRP range 760–880 kHz
• Ultra High-Definition SideVü frequency: 1.2 MHz (1,200 kHz), CHIRP range 1,060–1,170 kHz
• Transmit power: 500 W rms
• Maximum depth, Ultra High-Definition ClearVü: 200'
• Maximum depth, Ultra High-Definition SideVü: 125' to each side (250' total)

In the Box:

• GCV 20 black box
• Right-angle power cable
• Right-angle ethernet cable
• Mounting hardware
• Documentation

GT34UHD-TM Transom Mount Transducer — Specifications:

• Ultra High-Definition ClearVü frequency: 0.8 MHz (800 kHz), CHIRP range 760–880 kHz
• Ultra High-Definition SideVü frequency: 1.2 MHz (1,200 kHz), CHIRP range 1,060–1,170 kHz
• Power: 500 W
• Beamwidth, Ultra High-Definition ClearVü: 0.74° × 46°
• Beamwidth, Ultra High-Definition SideVü: 0.44° × 55°
• Maximum depth, Ultra High-Definition ClearVü: 200' down
• Maximum depth, Ultra High-Definition SideVü: 125' to each side (250' total)
• Transducer arrays: 3 (includes dedicated downward-facing element)
• Mount type: Transom mount