Article 15 3.

An employer within the meaning of Article 11(4) of the basic Regulation who has an employee on board a vessel flying the flag of another Member State shall inform the competent institution of the Member State whose legislation is applicable thereof whenever possible in advance. That institution shall, without delay, make information concerning the legislation applicable to the person concerned, pursuant to Article 11(4) of the basic Regulation, available to the institution designated by the competent authority of the Member State whose flag, the vessel on which the employee is to perform the activity, is flying.