Word: sonar
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...officers were flabbergasted by the disaster and privately were quick to blame Waddle. Although 16 civilians were aboard, they did little more than "pretend to drive" the submarine during the rapid ascent drill, Navy officers said. Waddle and his crew were still responsible for scouring the surface with their sonar and periscope before launching the "emergency main ballast blow." The choppy waters and the ship's white color may have made detecting the trawler difficult. But Navy officers said that if, as the trawler's crew said, their vessel was steaming at 11 knots, it should have been generating enough...
...Japanese fishing boat Ehime Maru was going nowhere fast. Civilians and Navy personnel on board the submarine that day reported that careful and routine surveillance did not at any time reveal the presence of ships nearby. On Tuesday, however, National Transportation Safety Board officials revealed that the sub's sonar had in fact picked up the Maru just over an hour before the collision. In addition, the Greenville's fire control technician, who's responsible for plotting the sub's position using sonar contacts, told investigators he was distracted from his job less than an hour before the collision...
...turns out the submarine sonar did, in fact, pick up the fishing boat. What do you make of that...
...fact that the sub crew saw the ship about an hour before impact. So you have a track on this ship, and then you lose it. To me, it makes a lot more sense than, gee, we never saw it. At least they did see it; at least the sonar is working...
...When you're conducting an emergency blow as an exercise, you're supposed first to make very sure there's nothing above you. So you come up to 50 or 60 feet below the surface and use your sonar to scan the area, and make a visual check using your periscope. You then go back down to 300 or 400 feet, and launch the emergency procedure. Getting back down takes about five minutes, and something could conceivably move into your path in that time. But your periscope is supposed to give you extended visibility of the area, and your sonar...