When a pilot comes aboard, it is often a difficult question to say what are his duties and those of the master in connection with the navigation. No ship is large enough' for two captains. It may be said, in general, that the pilot has charge of the navigation, including the course to steer, the time, place, and method of anchorage, and, in general, the handling of the ship. The master must not interfere unless the pilot is plainly reckless or incompetent.
Robert M. Hughes
September 10, 1855 – January 15, 1940 Admiralty Law, 1920, p.36
see also Master Authority
see also Master Liability