Garmin GSD28 Sonar Module

Sale price$2,999.99


Garmin GSD28 Sonar Module

Model: 010-02797-00

  • High-powered sonar black box engineered for superior sport fishing at extreme depths

  • Next-generation xCHIRP sonar technology provides our clearest fish arches for excellent target separation, smooth bottom returns and precise targeting

  • Garmin RapidReturn™ sonar is our the fastest deep-water scrolling sonar

  • Garmin RapidReturn™ sonar fills the sonar screen faster, allowing a captain to make fast and informed decisions based on what is below their boat

  • Add the MSC™ 10 external satellite compass (sold separately) to eliminate wave and swell from your sonar returns with heave compensation

  • Compatible with a wide range of Garmin and AIRMAR® transducers (sold separately)

  • Ideal for retrofitting to boats with existing bare wire transducers by using manual configuration settings

  • Can output 300 watts to 3 kW with a maximum depth of 10,000’ (transducer-dependent)

  • Supports dual-channel CHIRP (up to 3 kW per channel)

  • 25 to 250 kHz frequency range (transducer dependent)

  • Rated for harsh marine environments and water-resistance with an IPX7 rating

The depths. Revealed. Take your sport fishing to extreme depths with GSD™ 28, a high-powered sonar module with features to improve your chances for success (transducer-dependent). Garmin RapidReturn™ sonar provides quicker returns on your chartplotter with 2 to 6 times the ping rate of our GSD 26, so you see fish before you’re out of range (transducer-dependent). Easily distinguish bait from sport fish, and get our clearest sonar with next-generation xCHIRP technology. GSD 28 supports a wide range of Garmin and AIRMAR® transducers (sold separately) that can be manually or automatically configured. When the seas get rough, ensure flat bottom returns with the MSC™ 10 external heave compensation sensor (sold separately).

The GSD 28 module is ideal for retrofitting to boats with existing bare wire transducers.



Case material
Fully gasketed, aluminum housing, steel back panel, plastic access panel

Physical dimensions
10.7" 14.4" 4.0" (27.06 cm 36.66 cm 10.1 cm)

14.13 lbs (6.4 kg)

Water rating

Temperature range
From 5° F to 158° F (from -15° C to 70° C)

Electrical Features

Power input
10-32 V

Power usage
120 W maximum


Sonar Features

Frequencies supported
Dual channel CHIRP: 25-250 kHz (tranducer dependant)

Transmit power
300W—3kW rms (transducer dependant)

300W—3kW rms (transducer dependant)
10,000 ft (3,048 m)


Rapid return


Garmin Marine Network Ports
1 (Garmin BlueNet)

Sonar connections
2 bare wire

What's in the Box:

  • GSD 28

  • Power cable

  • Garmin BlueNet™ marine network cable (6 ft) with legacy network adapter

  • Field installable adapter kit for the Garmin BlueNet network

  • Mounting hardware

  • Documentation

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