What is the primary purpose of distress signals under COLREGs?

The primary purpose of distress signals under the International Regulations for Preventing Collisions at Sea (COLREGs) is to indicate that a vessel is in distress and requires assistance. Distress signals serve a crucial role in maritime safety, acting as a means for vessels or individuals to communicate an emergency situation to others in the vicinity, signaling that they need immediate help due to various factors such as mechanical failure, grounding, capsizing, or any situation that places the safety of the crew or vessel at risk.

The signals are recognized internationally and are designed to be clearly understood by any vessel observing them, ensuring rapid response from other ships or search and rescue services. This universal understanding is vital, as quick action can be the difference between life and death in a maritime emergency.

Other options do not fulfill the same critical function. Communicating a ship's speed is not relevant to distress situations, signaling with the intention of simply communicating might not convey urgency, and signaling the end of a voyage does not imply a need for emergency assistance. Thus, the correct answer highlights the essential nature of distress signals in maritime operations and safety.