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Navigation Rules Practice Test

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Vessels "A" and "B" are meeting on a river as shown and will pass 1/4 mile apart. Which statement is TRUE?
  A. Whistle signals must be exchanged in all cases when passing within one half mile of each other. 
  B. The vessels should exchange two blast signals and pass port to port.
  C. If a passing agreement is reached by radiotelephone, whistle signals are optional, and the vessels should pass starboard to starboard as agreed.
  D. The vessels should pass port to port and must sound whistle signals only if either vessel changes course.