Straits are used for international navigation between one part of the high seas or EEZ and another part of high seas or EEZ. All ships (and aircrafts) have right of transit passage, which shall not be impeded; except is the strait is formed by an island of a state bordering the strait and its mainland. It shall also not apply, if there is route through high seas or EEZ, seaward of an island, which can’t be used due navigational and hydrographical characteristics. The ships during transit enjoy freedom of continuous and expeditious transit of strait (or EEZ).
Ships during unimpeded transit passage:

1. To comply with the International regulations, procedures and practices including COLREGS.
2. To comply with International regulations with respect to environmental pollution.