Question 352 Rules of the Road

The correct answer is C) If a passing agreement is reached by radiotelephone, whistle signals are optional, and the vessels should pass starboard to starboard as agreed. This is correct because under the Inland Navigation Rules, vessels are allowed to agree on a passing arrangement by radiotelephone communication. If an agreement is reached, the vessels can pass starboard to starboard as agreed, and the use of whistle signals becomes optional. The key factor is that the vessels have communicated and agreed on the passing arrangement, making the use of whistle signals unnecessary. The other options are incorrect because they do not account for the ability to agree on a passing arrangement by radio. Option A is incorrect as the vessels should pass starboard to starboard, not port to port. Option B is incorrect as whistle signals are optional if an agreement is reached. Option D is incorrect as the vessels should pass starboard to starboard, not port to port.