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Any Member which has ratified this Convention shall, in so far as practicable, advise its nationals on the possible problems of signing on a ship registered in a State which has not ratified the Convention, until it is satisfied that standards equivalent to those fixed by this Convention are being applied. Measures taken by the ratifying State to this effect shall not be in contradiction with the principle of free movement of workers stipulated by the treaties to which the two States concerned may be parties.