Garmin GSD 28 Sonar Module

See whats down there. Catch whats 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 rate¹of ourGSD 26sonar. 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 theMSC 10external satellite compass (sold separately) to greatly reduce wave and swell from your sonar returns.

Case material Fully gasketed, aluminum housing, steel back panel, plastic access panel Physical dimensions 10.7″14.4″4.0″ (27.06 cm36.66 cm10.1 cm) Weight 14.13 lbs (6.4 kg) Water rating IPX7 Temperature range From 5 F to 158 F (from -15 C to 70 C)