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Navigation Rules Practice Test

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You are approaching another vessel on crossing courses. She is approximately half a mile distant on your starboard bow. You believe she will cross ahead of you but she sounds a whistle signal of five short blasts. You should __________.
  A. sound a signal of one prolonged blast 
  B. make a large course change
  C. reduce speed slightly to make sure she will have room to pass
  D. wait for another whistle signal from the other vessel