Garmin GSD™ 25 Premium Sonar Module Review

Garmin GSD™ 25 Premium Sonar Module

The Garmin GSD™ 25 Premium Sonar Module is a premium remote network sonar solution. This high-end model offers an exceptional fishfinding with superb bottom tracking capabilities.

Scanning Sonar Images

The GSD™ 25 delivers the most detailed CHIRP ClearVü and SideVü scanning sonar images in the industry. The resolution, target separation and clarity of the sonar images offer an unparalleled view of fish and structure. Compatible Garmin chartplotters receive images with target details so precise and distinguishable that users can separate even small and closely spaced fish at depths down to 5,000 feet.

True Dual-channel 1kW CHIRP

This sophisticated module includes a true dual 1kW CHIRP as the mainline sonar technology for advanced target resolution and clarity. The CHIRP functionality, standing for Compressed High-Intensity Radiated Pulse, ensures a significantly better viewing experience than any other sonar system. To optimise sonar performance, users can adjust CHIRP frequencies to different settings.

In order to ensure the best performance, Garmin has developed proprietary transducers, sold separately, that are specifically designed to work with this advanced sonar system.


  • Frequency: Traditional: 50/200, 77/200, 83/200kHz, Single/Dual Channel CHIRP: 40-250kHz, SideVü/DownVü: CHIRP 455/800kHz and CHIRP 260/455kHz
  • Transmit Power: 1kW
  • Max. Depth: 5,000 ft
  • Dimensions: 9 7/8″W x 7 5/8″L x 2 5/8″D
  • Data Interface: Ethernet
  • Transducer: Sold separately
  • Waterproof Rating: IPX7
  • Warranty: Two years

Components Included in the Box

  • GSD 25 Premium Sonar Module
  • Right-angle power cable (6′)
  • Right-angle network cable (6′)
  • Mounting hardware
  • Documentation

Transducer Options

This product operates best with select transducers, sold separately. To complete your installation, choose from the following transducers, based on the specific readings needed:

Adjust content based on styling: Table of multiple transducer types and their specs, Model numbers etc.

Notable Compatibility

The Garmin GSD™ 25 Premium Sonar Module is compatible with devices such as GPSMAP 8000 Glass Helm Series and the GPSMAP 7400/7600 Series Displays, among others.

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