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Product DescriptionRaising the bar in fish-finding technology, the BSM-1 high-speed Ethernet-based system delivers peerless echo clarity and the highest underwater definition ever achieved. Whether you're identifying fish in kelp beds or deep canyons, this sounder has a tri-frequency capability for optimal water column performance: 200 kHz for shallow inshore, 50 kHz for deep offshore, or 83 kHz for a blend of both. By matching very efficient long pulses with a sensitive linear receiver, this broadband sounder can better track bottom in waters over 3,000 feet, even at cruising speeds. This plug-and-play module is compatible with the award winning Northstar 8000i and Simrad GB40 navigation systems. Separating noise from structure and bottom is the primary purpose of an echosounder, and with less noise, the BSM-1 spends more energy offering better resolution and returns. Meets IPX7 waterproof standard.