The commissioners of pilotage for the port of Port Royal shall, from time to time, organize a board of examiners for the port of Port Royal, to consist of three nautical men, at least one of whom shall be a full branch pilot of the port. No one shall be eligible for examination by the board of examiners until he has satisfactorily completed his apprenticeship and has been recommended by a majority of the full branch pilots. The board of examiners shall examine all such eligible and recommended applicants as to their competency to work or manage vessels and generally to discharge the duties of a pilot. All examinations for license shall be oral and written and by demonstration and shall include among other things the following requisites: The rules of the road, the use of compass, the set of currents, the boarding of vessels in heavy weather, bearings of noted objects, numbers, shapes and colors of buoys, and such other matters as the commissioners of pilotage for the port of Port Royal shall require to be included in such examination. No license or branch shall be granted to any person unless he has received a certificate of his competency signed by the majority of the board of examiners.