Which sound signal would indicate a turn to another vessel?

The sound signal that indicates a vessel is turning to another vessel is one short blast. This signal is used in various boating contexts to communicate intentions clearly between vessels to avoid collisions and ensure safe navigation. Specifically, one short blast conveys the message that the vessel intends to alter its course to starboard (to the right).

This system of sound signals is part of the International Regulations for Preventing Collisions at Sea (COLREGS), which helps maintain safe practices on the water by ensuring that all operators understand the intention behind each signal. Familiarity with these signals is crucial for safe boating and effective communication with other vessels.