Single Beam Sounders –Profiles only directly beneath transducer –Available in single (200Khz) and dual-frequency (~200kHz down to 24-40kHz)‏ –Beamwidths from 3 to 8 degrees –28% bottom coverage with 50 foot line spacing Multibeam Systems –Covers swath up to 2.5 to 6 times water depth –Produces terrain model down to 2ft x 2ft grid over area surveyed –Can see under some vessels and docks –200kHz to 450 kHz operating frequencies –Requires motion and heading sensors -Currently 1.5 to 2 times price of single beam survey -100% Bottom coverage Depth Sounding
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