OBS_VALUE:  the ship's captain,  engineer officer of the ship; skilled seaman and radio specialist need a qualification certificate in order to exercise the profession. The national Law is implementing Directive 2012/35/EU that establishes the minimum level of training of seafarers from MS. Articles 19-21 fix the procedure for recognising qualifications gained in a third country. This implicates that Licence otr authorisation is required to practice. 