Final answer:
The correct action for vessel B when encountering another power-driven vessel (A) must follow the Navigation Rules, and the action taken depends on the specific situation, including relative positions and movements of the vessels.
Step-by-step explanation:
As the operator of a power-driven vessel (B), you should follow the rules of navigation to safely coordinate passage with another power-driven vessel (A). The specific action you should take depends on various factors such as the bearing of the other vessel, visibility conditions, and any local maritime traffic regulations that may apply. Without additional information on the relative positions and movements of the vessels, it is not possible to provide a definitive answer to this question. Typically, one vessel is designated as the 'stand-on' vessel (maintains course and speed) and the other as the 'give-way' vessel (takes action to avoid collision), according to the Navigation Rules. However, in situations where you are unsure, the safest course of action is often to reduce speed and communicate with the other vessel to ensure a safe passage.