Section 64. Licenses

Every person employed as a master, pilot, engineer or
  joint pilot and engineer, on board of a public vessel, shall be examined
  by the inspector as to his  qualifications,  and  if  the  inspector  is
  satisfied  therewith,  he  shall grant him a license for the term of one
  year. In a proper case, the license may  permit  and  specify  that  the
  master  may  act  as pilot, and in case of small vessels may also act as
  joint pilot and engineer. The license shall be framed  under  glass  and
  posted  in  some  conspicuous  place  on the vessel on which he may act,
  provided that on vessels of less than ten  tons,  the  license  must  be
  carried but need not be posted. Whoever acts as master, pilot, engineer,
  or joint pilot and engineer, without having first received such license,
  except  as  in  this  article  otherwise specified, shall be guilty of a
  misdemeanor.  An applicant for license as master,  pilot,  or  engineer,
  must  be at least twenty-one years of age. An applicant for a license as
  joint pilot and engineer must be at least eighteen years of age.