Which vessels should a power-driven vessel underway keep out of the way of?

A power-driven vessel underway has a responsibility to keep out of the way of several types of vessels that are restricted in their ability to maneuver. This obligation is outlined in the International Regulations for Preventing Collisions at Sea (COLREGs).

First, a vessel not under command is unable to maneuver due to exceptional circumstances, which may include difficulty in controlling the vessel due to mechanical failure or other emergencies. This vessel requires the right of way as it cannot be expected to move out of the way.

Second, a vessel engaged in fishing, particularly when it is constrained by its gear, has limited ability to maneuver and thus should be given the right of way. This is often the case with trawlers or other fishing vessels with their nets deployed, as they may not be able to alter their course or speed effectively.

Lastly, sailing vessels generally have the right of way over power-driven vessels in certain conditions, especially when they are under sail. Though there are specific rules regarding the encounter of sailing vessels and power-driven vessels, the power-driven vessel is usually required to give way.

Given these responsibilities, a power-driven vessel must keep clear of all these vessel types to ensure safe navigation and to prevent collisions. Therefore, the answer that states a power-driven