What does Rule 35 state regarding sound signals for a vessel at anchor?

Rule 35 of the COLREGs (International Regulations for Preventing Collisions at Sea) specifically addresses sound signals for vessels at anchor. It states that a vessel at anchor must sound one short blast at intervals of not more than one minute. However, the proper sound signal for indicating distress or a specific situation, such as when other vessels may not be aware of its presence, can involve five or more short and rapid blasts.

In this context, the choice of five or more short and rapid blasts is a safety measure designed to alert other vessels to the potential hazard posed by the anchored vessel. This is particularly important in situations where visibility may be impaired or where other vessels might be navigating nearby. The emphasis on using distinct sound signals ensures that the intentions and situations of vessels are communicated clearly, enhancing safety on the water.

The other choices reflect scenarios or interpretations that do not align with the specific requirements outlined in Rule 35, as vessels at anchor must indeed signal their status to prevent collisions, regardless of weather conditions. Thus, the proper recognition of sound signals is critical to maintaining navigational safety.