At the choice of the shipowner, supervision is carried out by a recognised classification society or by the Maritime Safety Inspectorate.
If the ship is under the technical supervision of the Maritime Safety Inspectorate, the supervision of ships is based on a five-year cycle, according to which every five years the ship shall undergo an in-depth inspection – a renewal survey, and every year an annual survey, as well as between the second and third annual surveys, an intermediate survey in the dock in accordance with the requirements of Chapter 3 “Ship Surveys” of Cabinet Regulation No. 49 Adopted 29 January 2008 Regulations Regarding the Safety of Ships.
If the ship is under the technical supervision of a classification society, the scope and frequency of surveys shall be determined by the classification society.
In cases where the classification society carries out technical supervision of the ship, the Maritime Safety Inspectorate shall carry out additional inspections of the ship on an annual basis in accordance with paragraphs 9.2, 9.3 or 9.4 of Cabinet Regulation No. 439 Adopted 7 June 2011 Regulations Regarding the Implementation of Flag State Supervision of Ships.