What does the signal "_ . _ ." signify in international waters?

Answer: A — The vessel agrees to be overtaken

The signal "_ . _ ." refers to the International Morse Code for the letter 'R', which is used in maritime communication. In the context of COLREGs and navigating international waters, this specific signal indicates that the vessel agrees to be overtaken. The ability for a vessel to signal its intention to permit another vessel to pass is important for maintaining safe navigation and preventing collisions, especially in congested areas where vessels may be restricted in their ability to maneuver. This signal is part of a broader set of communications that vessels can use to navigate safely and effectively in the water. Understanding this communication method is crucial for mariners, as it enhances situational awareness and promotes a coordinated approach to navigation among different vessels.