The International Convention on Load Lines (ICLL) generally applies to ships engaged on international voyages, with the following exceptions:

• Ships of war
• Ships of less than 24 metres in length
• Pleasure yachts not engaged in trade
• Fishing vessels

The ICLL defines the maximum allowed draught of the ship, and how this is to be marked on the side of the ship.

The convention defines the requirements to be fulfilled for the structures, equipment and fittings. There are not expressly provided standards for strength and construction.

Right upon the survey conducted on board, PISR issues the International Load Line Certificate for proving the safety of the ship and crew.