When is the use of a urgency signal justified?

The use of an urgency signal is justified when a ship is in a situation where it requires assistance but is not in immediate danger of sinking. In the context of the International Regulations for Preventing Collisions at Sea (COLREGs), an urgency signal indicates that a vessel is experiencing a significant problem, such as being disabled, and needs help or support to address this issue.

When a ship is disabled, it may not be able to navigate properly, which poses risks not only to the vessel itself but also to other vessels in the vicinity due to potential drift or drifting into hazards. The urgency signal alerts other vessels and shore authorities to the situation, prompting them to provide necessary assistance or to be advised of the potential hazards posed by the disabled vessel.

In contrast, other situations such as requesting fuel, changing course, or arriving at a port do not warrant the use of an urgency signal. These scenarios do not signify an immediate need for help or present a danger that would require the attention and resources of other vessels or authorities. Therefore, the correct reasoning for when to use an urgency signal emphasizes the seriousness of being disabled at sea and needing external assistance.