Only Mate. certification;
An ONLY MATE must be nineteen years of age, and have been five years at sea.
IN NAVIGATION.- In addition to the qualifications required for a Second Mate,
an Only Mate must be able to observe and calculate the amplitude of the sun, and deduce the variation of the compass therefrom, and be able to find the longitude by chronometer by the usual methods.
He must know how to lay off the place of the ship on the chart, both by bearings of known objects, and by latitude and longitude. He must be able to determine the error of a sextant, and to adjust it, also to find the time of high water from the known time at full and change.

IN SEAMANSHIP. - In addition to what is required for a Second Mate, he must know how to moor and unmoor, and to keep a clear anchor; to carry out an anchor; to stow a hold; and to make the requisite entries in the ship's log.
He will also be questioned as to his knowledge of the use and management of the mortar and rocket lines in the case of the stranding of a vessel, as explained in the official log-book.

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