There is a fixed blood alcohol content limit of 0.50 that applies to the vessels for which educational requirements are made of the master or of the mate, if relevant, as well as to water scooters and similar vessels. Thus, the blood alcohol content limit covers
- recreational craft with a length of or above 15 metres (almost 50 feet),
- power boats for which a power boat licence is required, i.e. planing power boats, as well as
- water scooters and the like.
The regulations apply to anyone navigating a ship or performing work on board in a position of considerable safety importance.
In the recreational area, the regulations typically apply to the master and/or the helmsman and the navigator. But also others, for example a lookout, can be covered if they are to carry out work in a position of considerable importance to safety.
As regards commercial voyages, it means that the entire operational crew (the master, navigating officer, engineer officer and ship's assistants) is normally covered.
On board passenger ships, surveyors, pursers and servants who have been appointed to perform tasks of considerable importance to safety are also covered.
The regulations on the blood alcohol content limit also applies to persons who are not watchkeeping, but who must be able to step in to solve safety-related tasks, if necessary.