Boatswain’s Mate BM2 Advancement Practice Exam – Prep & Study Guide

The sound signal used by a power-driven vessel to indicate "I am altering my course to starboard" is one short blast. According to the International Regulations for Preventing Collisions at Sea (COLREGs), vessels are required to make specific sound signals to communicate their intentions to other vessels, especially in situations where visibility may be limited.

One short blast is universally recognized as the signal for a vessel indicating its intention to turn to starboard, helping to prevent collisions and ensuring safe navigation in busy waterways. Understanding and using these sound signals is crucial for effective communication and adherence to maritime regulations, which enhances safety for all vessels on the water.