N.Y. Nav. Law § 64

§ 64. Licenses. Every person employed as a master, pilot, engineer or\njoint pilot and engineer, on board of a public vessel, shall be examined\nby the inspector as to his qualifications, and if the inspector is\nsatisfied therewith, he shall grant him a license for the term of one\nyear. In a proper case, the license may permit and specify that the\nmaster may act as pilot, and in case of small vessels may also act as\njoint pilot and engineer. The license shall be framed under glass and\nposted in some conspicuous place on the vessel on which he may act,\nprovided that on vessels of less than ten tons, the license must be\ncarried but need not be posted. Whoever acts as master, pilot, engineer,\nor joint pilot and engineer, without having first received such license,\nexcept as in this article otherwise specified, shall be guilty of a\nmisdemeanor. An applicant for license as master, pilot, or engineer,\nmust be at least twenty-one years of age. An applicant for a license as\njoint pilot and engineer must be at least eighteen years of age.\n