Cap. 234 Art. 73Penalty on ship not showing colours. 

(1) A registered ship shall hoist the Maltese flag on

 entering or leaving any foreign port and, if of fifty tons gross tonnage or upwards, on entering or leaving any port in Malta.

(2) If default is made on board any such ship in complying with this article, the master of the ship shall, for each offence, be liable to a fine (multa) not exceeding one hundred units.