Garmin GCV™ 20 Ultra HD Scanning Sonar Black Box w/GT34UHD-TM Ultra HD Transom Mount Transducer
Garmin GCV™ 20 Ultra HD Scanning Sonar Black Box w/GT34UHD-TM Ultra HD Transom Mount Transducer — Product description
Imagine gliding across the water, your eyes locked on a chartplotter screen revealing fish hugging underwater structures and vast schools darting through the depths with razor-sharp precision. That's the edge the GCV 20 Ultra HD scanning sonar black box delivers, paired with the GT34UHD-TM transom mount transducer. This powerhouse setup transforms how serious anglers hunt, scout, and dominate the water by painting crystal-clear pictures of what's below and to the sides—without the guesswork of fuzzy traditional sonar.
Redefining Fish-Finding Precision
At the heart of this system lies Ultra High-Definition scanning technology that punches above its weight. The downward-facing ClearVü mode channels focused energy straight down, illuminating structure and baitfish up to 200 feet below your hull with jaw-dropping detail. You'll spot subtle ledges, drop-offs, and individual fish that lower-frequency sonars blur into oblivion.
Flip to SideVü, and it sweeps 125 feet to each side—250 feet total coverage—revealing hidden coves, weedlines, and roaming predators in stunning side profiles. Operating at ultra-high frequencies (800 kHz for ClearVü and 1,200 kHz for SideVü), it captures finer resolution than ever, letting you pinpoint prime spots on your first pass and adjust your approach instantly.
Networked Power for Multi-Screen Mastery
No more fighting over a single display. With three Garmin Marine Network ports, the compact black box shares real-time sonar feeds across multiple chartplotters on your vessel. Integrate it effortlessly with Panoptix live sonar for a 360-degree awareness bubble, giving your crew the ultimate tactical advantage during tournaments or family outings alike.
This isn't just about seeing more—it's about seeing smarter. Anglers report landing trophy catches in record time, thanks to the system's ability to differentiate bait from game fish amid complex bottom clutter.
Built Tough for Real-World Waters
Measuring a sleek 9.9 x 7.6 x 2.6 inches and weighing under 2 pounds, the IPX7-rated black box shrugs off spray, submersion, and brutal conditions from 5°F to 158°F. The GT34UHD-TM transducer, with its 20-foot cable and 12-pin connector, mounts securely on transoms from 0° to 70° deadrise—or switch to the included trolling motor mount for forward-facing finesse.
- Depth and temperature sensing built-in for comprehensive water column intel.
- 500W RMS transmit power ensures reliable performance even in choppy seas.
- Beamwidths optimized: 0.74° x 46° (ClearVü) and 0.44° x 55° (SideVü) for pinpoint accuracy.
Streamlined Setup for Quick Wins
Installation boils down to connecting the right-angle power and Ethernet cables, securing the black box with included hardware, and deploying the transducer. Most boaters wrap it up in under an hour, no specialized tools required. Pro tip: Position the transom mount just above the hull-waterline intersection for optimal beam spread and minimal turbulence interference. Once networked, calibrate frequencies via your chartplotter for tailored performance to your local waters.
Maintenance is straightforward—rinse with freshwater after saltwater exposure and inspect mounts seasonally to keep readings pristine.
Key Specifications at a Glance
| Feature | Details |
|---|---|
| Frequencies | ClearVü: 800 kHz (CHIRP 760-880 kHz) SideVü: 1,200 kHz (CHIRP 1,060-1,170 kHz) |
| Max Depth | ClearVü: 200 ft down SideVü: 125 ft per side (250 ft total) |
| Power Output | 500W RMS |
| Black Box Dimensions | 9.9" x 7.6" x 2.6" (251 x 192 x 66 mm) |
| Waterproof Rating | IPX7 |
Frequently Asked Questions
What makes the Ultra HD scanning different from standard sonar?
Ultra HD uses higher frequencies (800-1,200 kHz) for finer image resolution, revealing fish and structure details that conventional sonar misses, especially in shallow to mid-depths up to 200 feet.
Can I use this with multiple chartplotters?
Yes, the three Marine Network ports allow seamless sharing of sonar images across compatible Garmin chartplotters, plus integration with Panoptix for enhanced coverage.
Is the transducer suitable for my boat's transom?
It supports 0° to 70° transom angles and includes a trolling motor mount option, making it versatile for most fiberglass, aluminum, or wood hulls.
How deep does SideVü scan to the sides?
Up to 125 feet on each side for 250 feet total width, ideal for quickly mapping shorelines, reefs, and fish-holding structures.
What's included for installation?
The kit comes with the GCV 20 black box, GT34UHD-TM transducer, transom and trolling motor mounts, right-angle power/Ethernet cables, mounting hardware, and documentation.
Does it measure water temperature?
Yes, the transducer provides accurate depth and temperature readings alongside scanning sonar data.
Is it weatherproof for offshore use?
Absolutely—the IPX7 rating protects against immersion, and it operates reliably from 5°F to 158°F.
Equip your rig with this game-changer and watch your catch rates soar. It's not just sonar—it's your secret weapon on the water.
GCV™ 20 Ultra HD Scanning Sonar Black Box with GT34UHD-TM Ultra HD Transom Mount Transducer
Add Ultra High-Definition Scanning Sonar to Your Compatible Chartplotter
The easy-to-install, networkable GCV 20 sonar black box allows you to redefine clarity and detail. Add any of the 3 GT34UHD transducer models to see stunningly clear Ultra High-Definition ClearVü and Ultra High-Definition SideVü scanning sonars — with frequencies ranging from 0.8 MHz (800 kHz) to 1.2 MHz (1,200 kHz) — to your compatible chartplotter. And you can share sonar images seamlessly across multiple networked chartplotters as well as networking Panoptix™ all-seeing sonar. It includes a max power output of 500 watts.
Ultra High-Definition ClearVü Scanning
This mode 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
This mode delivers 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.
Specifications:
General:
- Physical dimensions: 9.9"×7.6"×2.6" (251mm × 192mm × 66mm)
- Weight: 1.86lbs (845g)
- Water rating: IPX7
- Garmin Marine Network™ ports: 3
- Temperature range: From 5°F to 158°F (from -15°C to 70°C)
Sonar Features & Specifications:
- Frequencies supported:
- 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: 1,060-1,170 kHz
- Transmit power: 500W rms
- Maximum depth:
- 200' Ultra High-Definition ClearVü
- 125' to each side Ultra High-Definition SideVü, 250' total
What's In The Box?:
- GCV 20
- Right-angle power cable
- Right-angle ethernet cable
- Mounting hardware
- Documentation
GT34UHD-TM Ultra HD Transom Mount Transducer
Ultra High-Definition Sonar System Transom Mount Transducer
Add stunningly clear Ultra High-Definition ClearVü and Ultra High-Definition SideVü scanning sonar images to your compatible chartplotter via the GCV™ 20 sonar module. It includes 3 arrays, including a downward-facing element, with frequencies ranging from 0.8 MHz (800 kHz) to 1.2 MHz (1,200 kHz).
Ultra High-Definition ClearVü Scanning
This mode 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
This mode delivers 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.
Specifications:
- 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: 1,060-1,170 kHz
- Power: 500W
- Beamwidth:
- Ultra High-Defintion ClearVü: 0.74° x 46°
- Ultra High-Defintion SideVü: 0.44° x 55°
- Maximum depth
- Ultra High-Defintion ClearVü: 200' down
- Ultra High-Defintion SideVü: 125' sides, 250' total
- Depth/Speed/Temperature: Depth and Temperature
- Number of pins: 12-pin
- Cable length: 20'
- Supported deadrise/Transom angles: 0°-70° degree transom
The system includes an easy-to-install, networkable GCV 20 sonar black box with three-array sensors; includes a beam and a traction motor bracket. See the surprising difference in sharpness between the standard scanning sonar on the left and the ultra-high-definition ClearVü scanning sonar on the right. The ultra-high-definition scanning sonar system can provide clear and delicate structure and fish images, and the ultra-fine detail ultra-high-definition ClearVü sonar can provide clear image structure and fish image clarity, and it is 200 feet deep underwater. ferry. Multiple networked chartplotters and networked Panoptix all-around sonar seamlessly share structure and fish to the side of the ship. Redefine clarity and detail through the ultra-high-definition scanning sonar system. Using the easy-to-install networkable GCV 20 sonar black box and the included three-array GT34UHD sensor, you can now scan ultra-high-definition sonar images. You will see everything on the bottom and sides of the boat with amazing clarity and clarity. Ultra HD Sonar Ultra HD ClearVü Scan This sonar system applies more power to the target through downward elements. Compared with other high-frequency scanning sonars, it provides a greater depth of under-ship structures and fish. Excellent image clarity. Ultra-high-definition SideVü scans can see clear, clear structural images, which are hung on the side of the ship. In this way, you can quickly and quickly scout the fishing area, because you can see such amazing clarity the first time. Sharing sonar images You can seamlessly share ultra-high-definition scanned sonar images among multiple networked chartplotters. You can also add the optional Panoptix omnidirectional sonar to the network sonar.
SKU: NVN-70801
MPN: 010-02055-00
UPC: 753759206307
Technical specifications
| Brand | Garmin |
| Model | Garmin GCV™ 20 Ultra HD Scanning Sonar Black Box w/GT34UHD-TM Ultra HD Transom Mount Transducer |
| SKU / MFR# | 70801 |
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