Garmin offers three external CHIRP sounder modules, the GCV 10, the GSD 25 and the GSD 26. These sounders connect to compatible displays through a Garmin Marine Network high-speed cable.
The GCV 10 is a dual-band sounder which uses an included Garmin transom-mounted transducer.
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The GSD 25 is a dual-band CHIRP sounder that uses Airmar dual-band 1kW transducers in the Low/Medium or Low/High bands.
The GSD 26 is a high-performance dual-band CHIRP sounder that can be used with any Airmar CHIRP sounder rated at up to 3kW power in the Low/Medium or Low/High bands, including wide-beam models.