When does Rule 15 apply?

Answer: C — Only power-driven vessels in a crossing situation

Rule 15 of the COLREGs (International Regulations for Preventing Collisions at Sea) specifically addresses the situation of vessels crossing paths. It primarily pertains to the responsibility and navigation of power-driven vessels when they are in a crossing situation. This rule determines which vessel is the give-way vessel and which is the stand-on vessel during such encounters, ensuring safe passage and proper navigation practices. The emphasis on power-driven vessels reflects their operational capabilities and the dynamics of maneuverability compared to sailing vessels. In this context, the incorrect options highlight situations that are either outside the scope of Rule 15 or don't accurately reflect its applicability. While it may seem that Rule 15 could apply to all types of vessels or specifically to sailing vessels, it is essential to recognize that the rule is particularly crafted for situations where the interaction between power-driven vessels occurs in crossing scenarios. Thus, it emphasizes the conditions and responsibilities relevant to those engaged in navigation with power-driven craft, aligning with the practical realities of maritime operations.