4. —(1) Subject to subsection (2), the master of a vessel which—

(a) is registered in a Convention state which is a party to the Agreement, and

(b) is boarded by an enforcement officer outside the F3[outer limit of the territorial sea] of the State,

shall be entitled to communicate with the authorities of the Convention state concerned and the owner or operator of the vessel for the purpose of notifying them that the vessel has been boarded.

(2) An enforcement officer may prevent or delay communication under subsection (1) if he or she is satisfied that such communication would obstruct the investigation of an offence.