Deck : Rules of the Road - 426/1025
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| BOTH INTERNATIONAL & INLAND What signal indicates doubt that sufficient action is being taken by another vessel to avoid collision? |
| A) Three long blasts of the whistle |
| B) One prolonged blast followed by three short blasts of the whistle |
| C) Three short and rapid blasts of the whistle |
| D) Five short and rapid blasts of the whistle |
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