Garmin GSD 28 Sonar Module

See what’s down there. Catch what’s down there. Take your sport fishing to extreme depths with a high-powered sonar module with the features you need to improve your chances for success.

Garmin RAPIDRETURN SONAR

This high-performance technology provides our fastest deep-water scrolling sonar with 2 to 6 times the ping rate¹ of our 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 our clearest traditional sonar fish arches and excellent target separation. Get smooth bottom returns and precise targeting at extreme depths¹.

HEAVE COMPENSATION

When the seas get rough, use the MSC™ 10 external satellite compass (sold separately) to greatly reduce wave and swell from your sonar returns.