picketboat

picketboat

(ˈpɪkɪtˌbəʊt)
n
(Nautical Terms) nautical a boat which keeps guard
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References in periodicals archive ?
carrier believed to be in the area is the Saratoga.'' (78) These estimates were based on information from a Japanese picketboat that the Americans had employed three carriers in their raid on Tokyo on 18 April.
Each security division consisted of flotillas of picketboats, submarine chasers, minelayers, and minesweepers.