The Garmin GSD28 Sonar Module is a rugged, high-powered sonar box designed for serious sport anglers upgrading their boat for deep-water imaging. With next-generation xCHIRP technology and RapidReturn, it delivers ultra-clear arches, superb target separation, and fast bottom updates for confident lure placement and trophy catches.
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Frequencies supported: Dual channel CHIRP: 25–250 kHz (transducer dependent)
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Transmit power: 300 W–3 kW RMS (transducer dependent)
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xCHIRP: Yes for clearer arches and better target separation
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RapidReturn: Faster returns on your chartplotter—2 to 6 times the ping rate of the GSD 26
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Maximum depth: Up to 10,000 ft (3,048 m) (transducer dependent)
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Design and build: Fully gasketed aluminum housing with steel back panel and plastic access panel; IPX7 rated
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Compatibility: Compatible with a wide range of Garmin and AIRMAR transducers (sold separately)
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Networking: Garmin Marine Network ports (1 BlueNet) and 2 bare-wire sonar connections
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MSC compatibility: MSC external satellite compass adds heave compensation to minimize wave effects (sold separately)
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Physical dimensions: 10.7" x 14.4" x 4.0" (27.06 cm x 36.66 cm x 10.1 cm)
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Weight: 14.13 lbs (6.4 kg)
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Electrical features: Power input 10–32 V; Power usage up to 120 W; Fuse 15A
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Operating temperature: 5°F to 158°F (-15°C to 70°C)
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Included 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
Designed for rugged marine use, the GSD28 enables deep-water imaging with rapid updates and precise fish targeting, helping you decide where to cast and how to reel in your next trophy. Its flexible transducer compatibility and network options make it a practical upgrade or retrofit for boats already equipped with bare-wire transducers, while its compact footprint and robust construction keep it reliable in harsh conditions.
| 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 |
