A man was sighted as he fell overboard. After completing a Williamson turn，the man is not sighted. What type of search should be conducted?（）<br>A:Expanding circle<br>B:Sector search<br>C:Parallel track pattern<br>D:Datum-drift search

A man was sighted as he fell overboard. After completing a Williamson turn，the man is not sighted. What type of search should be conducted?（）
A:Expanding circle
B:Sector search
C:Parallel track pattern
D:Datum-drift search

出自：海船船员证

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