What does the Coxswain need to do after the bow line is cast off?

When the bow line is cast off, the coxswain must focus on maneuvering the vessel safely away from the dock or other stationary objects. Shifting the rudder and backing away is the correct procedure because it allows for controlled movement of the boat, ensuring that it can navigate away from the docking position without colliding with anything nearby. This action is crucial for maintaining safety and control during the departure.

The other options, such as calling for help, preparing for docking, or turning off the navigation lights, do not align with the immediate responsibilities in this scenario. Calling for help would be necessary only if there was an emergency. Preparing for docking would be relevant if the boat were approaching a dock rather than departing, and turning off navigation lights would generally happen after leaving the dock when it is safe to do so, not immediately after casting off. Thus, focusing on shifting the rudder and backing away is the best and most appropriate action for the coxswain at this moment.