Boaters encounter them all the time near major ports - tankers, freighters and barge-pushing tugs - and they are wise to give them wide berth.
The National Transportation Safety Board continued to investigate the July 7 deaths of two Hungarian tourists in a collision between a duck boat and a tug-and-barge on the Delaware River near downtown Philadelphia.
Tom Rau is an expert on boating safety who served 27 years in the Coast Guard (California and Lake Michigan). He retired in 2002 as a senior chief, responsible for the auxiliary substation at South Haven, Mich. He has participated in about 500 search-and-rescue missions.
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