The Garmin GCV 20 Ultra HD Scanning Sonar Black Box combined with the GT34UHD-TM Ultra HD Transom Mount Transducer upgrades any compatible Garmin chartplotter with Ultra High-Definition ClearVü and SideVü imaging. Working across 0.8 MHz (800 kHz) and 1.2 MHz (1,200 kHz) CHIRP frequencies, the system renders structure and fish in exceptional detail both directly beneath the hull and out to the sides. The GCV 20 connects to up to three Garmin Marine Network ports, shares data across multiple chartplotters, and supports Panoptix all-seeing sonar. The GT34UHD-TM uses a three-array transducer design — including a dedicated downward-facing element — for maximum resolution throughout the water column.

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