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GSD™ 28 Advanced Sonar Module
See what’s down there. Catch what’s down there. Take sport fishing to extreme depths with a high-powered sonar module with the features that are needed to improve the chances of success.
Features:
Garmin RapidReturn Sonar
This high-performance technology provides Garmin's fastest deep-water scrolling sonar with 2 to 6 times the ping rate of Garmin's GSD™ 26 sonar. This allows captains to make fast and informed decisions based on what is below their boats.
xCHIRP Technology
Easily distinguish bait from sport fish with Garmin's clearest traditional sonar fish arches and excellent target separation. Get smooth bottom returns and precise targeting at extreme depths.
Heave Compensation
When the seas get rough, use the MSC™ 10 external satellite compass (sold separately) to greatly reduce wave and swell from the sonar returns.
Compatibility
Transducer Support
This sonar module is compatible with a wide range of Garmin and AIRMAR® transducers (sold separately).
Retrofitting
The GSD 28 module is ideal for retrofitting boats with existing bare wire transducers.
Performance
Sonar Power
GSD 28 can output 300 watts to 3 kW at extreme depths
CHIRP Support
The module supports dual-channel CHIRP (up to 3 kW per channel).
Operation Range
The GSD 28 sonar module can operate in the 25 to 250 kHz frequency range.
Built to Last
GSD 28 is rated for harsh marine environments and water resistance with an IPX7 rating.
In the Box:
Specifications
General:
Electrical Features:
Sonar Features:
Connections:
WARNING: This product can expose you to chemicals including NICKEL (METALLIC) which is known to the State of California to cause cancer. For more information go to P65Warnings.ca.gov.
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Jig Shack Outdoors is the official retail expansion of Jig Shack, founded by Bruce West. Established February 3, 2026 under new ownership by Brian West, we provide a full-line outdoor retail storefront including fishing tackle, apparel, custom-painted lures, and tungsten products. While carrying the original Jig Shack private-label products, we operate as an independent retail business serving anglers and outdoor enthusiasts.
© 2026, Jig Shack Outdoors