Artikel 23

Each Party shall take such measures as may be necessary to establish its jurisdiction over the offences it has established in accordance with Article 3, paragraph 1, of the 1988 Convention, when:
a) the offence is committed in waters under its sovereignty or where applicable in its contiguous zone;
b) the offence is committed on board a vessel flying its flag or an aircraft which is registered under its laws at the time the offence is committed;
c) the offence is committed on board a vessel without nationality or assimilated to a ship without nationality under international law, which is located seaward of the territorial sea of any State;
d) the offence is committed on board a vessel flying the flag or displaying the marks of registry or bearing any other indication of nationality of another Party, which is located seaward of the territorial sea of any State.