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Clarity and detail are redefined with the Ultra High-Definition scanning sonar system. 

Using an easy-to-install, networkable GCV 20 sonar black box with an included three-array GT34UHD transducer, now you can get scanning sonar images in ultra high-definition. 

You see everything below and off to the sides of your boat in amazingly sharp, crisp detail.

Ultra High-Definition ClearVü Scanning
This sonar system 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
See 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.

Share Sonar Images
You can share your Ultra High-Definition scanning sonar images seamlessly across multiple networked chartplotters.

You can also add optional Panoptix all-seeing sonar to your networked sonars.


pdf download icon  GCV 20 Installation Instructions

pdf download icon  Installation Instructions GT34UHD-TM


  • 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
  • Temperature range: From  -15°C to 70°C

Sonar Features & Specifications

  • Ultra High-Definition ClearVü: Yes
  • Ultra High-Definition SideVü: Yes
  • 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: 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'


  • Compass-safe distance 10.2 in. (26 cm)

In the Box

  • GCV 20 Sonar Black Box
  • GT34UHD-TM transducer
  • Transom mount
  • Trolling motor mount
  • Right-angle power cable
  • Right-angle ethernet cable
  • Mounting hardware
  • Documentation

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