What is the exchange of signals when two vessels meet head-on?

When two vessels are approaching each other head-on, the proper signaling protocol involves the exchange of blasts to communicate intentions. The correct response in this scenario is a single short blast followed by altering course to the right. This signifies that the vessel intends to pass on the right side (starboard) of the other vessel.

The reasoning behind this is rooted in the International Regulations for Preventing Collisions at Sea (COLREGS), which aim to promote safe navigation and avoid collisions. When vessels meet head-on, the one signaling one short blast indicates its planned maneuvering to ensure safe passage.

The other options represent situations or signaling protocols that do not align with the established regulations for head-on encounters. For example, passing starboard to starboard is a typical protocol but requires specific communication that is not defined correctly in the alternatives. Thus, understanding the signaling for navigating head-on situations is critical for ensuring clarity and safety on the water.