As a management level engineering officer planning for transitioning from the maneuvering watch posted when departing a US port to at sea manning on a vessel classed for a periodically unmanned engine room, in consultation with the ship's master, when would the transition take place?

Correct Answer: Option A — When leaving the navigable waters of the US which is 3 nautical miles from the coast line.

Navigable waters of the United States are defined as extending 3 nautical miles from the baseline. Periodically unmanned engine room (UER) operations and transition from maneuvering watches generally occur once the vessel clears these restricted waters, subject to the Master and Chief Engineer's concurrence.