Because Crabster weighs 150~
200 kg in water, it can keep its posture and position more stably on seafloor
even in current. Crabster has acoustic instrument against turbid water. In
addition to the default sonars, we installed additional sonars when we were
waiting in pier. We had additional scanning sonar for vertical scan and
additional multi-beam sonar for real-time image in more range. Our team
developed AUVs and ROVs for last 20 years, those propeller-driven subs tends to
drift by current which is resulted to entangle the tether cable with mooring
line of other ships or barge. I think the ROVs deployed at ferry site were not
different.
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