Simrad currently offers two external CHIRP sounder modules, the SonarHub and the BSM-3. The BSM-2, a predecessor to the BSM-3, is now discontinued. These sounders connect to compatible displays through a Simrad Ethernet cable.
The SonarHub is an external CHIRP sounder which uses Airmar low-power single-band transducers in the Low, Medium or High bands.
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The BSM-3 is a high-performance CHIRP external sounder that uses Airmar dual-band CHIRP transducers in the Low/Medium and Low/High bands.
The BSM-2 is a previous generation of the BSM-3 and is now discontinued..
The S5100 supports three CHIRP channels and can be used with a dual-band and a single-band CHIRP transducer simultaneously.