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
| General |
| 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) |
| Weight |
14.13 lbs (6.4 kg) |
| Water rating |
IPX7 |
| 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 |
| Fuse |
15A |
| 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) |
| xCHIRP |
Yes |
| Rapid return |
Yes |
| Connections |
| Garmin Marine Network Ports |
1 (Garmin BlueNet) |
| Sonar connections |
2 bare wire |
