Take sport fishing to extreme depths with the Garmin GSD28 Sonar Module (model 010-02797-00). This high-powered black box delivers ultra-clear fish arches, superb target separation, and smooth bottom returns thanks to next-generation xCHIRP sonar technology. With Garmin RapidReturn sonar, you’ll enjoy the fastest deep-water scrolling to see what's below your boat sooner, empowering quick, informed decisions on where to cast and how to reel in your next trophy.

Unmatched depth, clarity, and speed

• Next-generation xCHIRP sonar for the clearest arches and excellent target separation
• RapidReturn sonar provides faster returns on your chartplotter—2 to 6 times the ping rate of the GSD 26
• Precise bottom returns and easier bait vs. sport fish distinction
• Supports dual-channel CHIRP (up to 3 kW per channel) for high-powered, detailed imaging

Powerful, depth-expanding performance

• Transmit power: 300 W to 3 kW rms (transducer-dependent)
• Maximum depth: up to 10,000 ft (3,048 m) (transducer-dependent)
• Frequency range: 25–250 kHz (transducer dependent)
• IPX7-rated for harsh marine environments

Smart compatibility and easy retrofitting

• Compatible with a wide range of Garmin and AIRMAR transducers (sold separately)
• Ideal for retrofitting boats with existing bare wire transducers using manual configuration
• MSC™ 10 external satellite compass (sold separately) adds heave compensation to minimize wave and swell effects on sonar returns

Rugged build, reliable operation

• Fully gasketed aluminum housing with a steel back panel and plastic access panel
• Dimensions: 10.7" x 14.4" x 4.0" (27.06 cm x 36.66 cm x 10.1 cm)
• Weight: 14.13 lbs (6.4 kg)
• Operating temperature: 5°F to 158°F (-15°C to 70°C)

Connectivity and what’s in the box

• Garmin Marine Network connectivity: Garmin BlueNet ports for seamless integration
• What's in the box:
  • GSD 28 module
  • 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
• Sonar connections: 2 bare wire inputs

Technical specifications at a glance

• Case material: Fully gasketed aluminum housing; steel back panel; plastic access panel
• Power input: 10–32 V
• Power usage: 120 W maximum
• Fuses: 15A
• Connections: Garmin BlueNet network; 1 Garmin Marine Network port; 2 bare wire sonar connections