They have a fixed berth and scheduled downtimes. Often these vessels share bunker supply in a port. This common use of one supply point may also demonstrate the case for the use of LNG - depending on local interests. With regard to ship design and construction, the introduction of the IGF Codel 0 by IMO MSC11 with effect from 1 January 2017 has provided legal certainty for ship design. A key aspect is that maritime regulation is harmonized globally, whereas onshore regulation can fall under the responsibility of a manifold of local authorities.