At the current rate set by The Merchant Shipping (Light Dues) Regulations 1997 (SI 1997/562), as amended.
No. Several classes of vessel are exempt, including ships putting in solely for bunkers, stores, crew changes, pilots, medical emergencies or because of stress of weather or damage (as long as they do not earn revenue from the call). Many small vessels and harbour craft are also exempt. Ships in ballast are no longer exempt.
A Type B ship in which the reduction in freeboard has been increased up to the total difference between the values for basic Type A and Type B freeboards, effectively making the ship a Type A ship. The ship must meet two compartment damage stability requirements. Only a small number of ships are B-100.
A code number for the applicable control action. Examples are: 10: Deficiency rectified; 15: Rectify deficiency at next port; 16: Rectify deficiency within 14 days; 17: Master instructed to rectify deficiency before departure; 18: Rectify non-conformity within 3 months; 19: Rectify major non-conformity before departure; 30: Grounds for detention; 40: Next port of call informed; 50: Flag State/consul informed; 70: Classification society informed; 85: Investigation of contravention of discharge provisions in MARPOL.