The entire control of the navigation and working of the ship lies with the master. He gives the course and general directions to the officer of the watch, who enters upon a slate, at the end of the watch, the course made, and the number of knots, together with any other observations. The officer of the watch is at liberty to trim the yards, to make alterations in the upper sails, to take in and set royals, topgallant sails, &c.; but no important alteration can be made, as, for instance, reefing a topsail, without the special order of the master, who, in such cases, always comes upon deck and takes command in person. When on deck, the weather side of the quarter-deck belongs to him, and as soon as he appears, the officer of the watch will always leave it, and go over to leeward, or forward into the waist. If the alteration to be made is slight, the master usually tells the officer to take in or set such a sail, and leaves to him the particular ordering as to the braces, sheets, &c., and the seeing all things put in place. The principal manoeuvres of the vessel, as tacking, wearing, reefing topsails, getting under way, and coming to anchor, require all hands. In these cases, the master takes command and gives his orders in person, standing upon the quarter-deck. The chief mate superintends the forward part of the vessel, under the master, and the second mate assists in the waist. The master never goes aloft, nor does any work with his hands, unless for his own pleasure. If the officer of the watch thinks it necessary to reef the topsails, he calls the master, who, upon coming on deck, takes command, and, if he thinks proper, orders all hands to be called. The crew, officers and all, then take their stations, and await the orders of the master, who works the ship in person, giving all the commands, even the most minute, and looks out for trimming the yards and laying the ship for reefing. The chief mate commands upon the forecastle, under the master, and does not go aloft. The second mate goes aloft with the crew. In tacking and wearing, the master gives all the orders, as to trimming the yards, &c., though the chief mate is expected to look out for the head yards. So, in getting under way, and in coming to anchor, the master takes the entire personal control of everything, the officers acting under him in their several stations.