The Garmin GCV™ 20 Scanning Sonar Black Box (Part Number: 010-02055-10) is a high-performance marine sonar processing module engineered to bring Ultra High-Definition ClearVü and SideVü scanning capabilities to compatible Garmin chartplotters and multifunction displays. Operating across ultra-high frequency ranges, this compact black-box unit translates sonar signals into crisp, photo-like imagery of submerged structure, brush piles, rocks, and fish positioning both beneath and to the sides of the vessel. Equipped with three built-in Garmin Marine Network ports, the GCV 20 allows for seamless plug-and-play Ethernet sharing of live sonar views, network data, and waypoints across multiple displays, making it an essential sonar expansion unit for serious anglers and boaters.

In the Box

GCV 20
Right-angle power cable
Right-angle ethernet cable
Mounting hardware
Documentation

Technical Specification

General
Dimension	9.9″×7.6″×2.6″ (251 mm × 192 mm × 66 mm)
Weight	1.86 lbs (845 g)
Water rating	IPX7
Temperature range	From 5°F to 158°F (from -15°C to 70°C)

Electrical Features
Power input	10-35 V
Power usage	10.5 W maximum
Fuse	4.0 A
Compass-safe distance	10.2 in. (26 cm)

Sonar Features
Ultra High-Definition ClearVü	✓
Ultra High-Definition SideVü	✓
Frequency	Ultra High-Definition ClearVü: 0.8 MHz (800 kHz), CHIRP range: 760-880 kHz Ultra High-Definition SideVü: 1.2 MHz (1,200 kHz), CHIRP range: 1,020-1,230 kHz
Transmit power	500 W rms
Maximum depth	200′ Ultra High-Definition ClearVü 125′ to each side Ultra High-Definition SideVü, 250′ total, at a maximum depth of 30′