Deep Water Penetration BSM-1 has the capability to track the bottom and see structure in deep offshore terrain and canyons up to 3000ft (1000m). Clearly Defined Structure The high-resolution linear receiver provides superior clarity in shallow and mid-water levels. 'Whisper' Into The Water Exceptionally low power with efficient long pulses make this the perfect 'low noise' sounder. Tri-Frequency Match the frequency with your fishing location: 200kHz for shallow waters, 50kHz for deep offshore and 83kHz for a blend of both. Fully Waterproof Certified to IPX7 standard. Ethernet Connectivity Connect to an NSS, NSE or NSO navigation system with ease.