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Article 6 1. In urgent cases the competent authority may allow a person to be employed for a single voyage without having satisfied the requirements of the preceding Articles. 2. In such cases the terms and conditions of employment shall be the same as those of seafarers in the same category holding a medical certificate. 3. Employment in virtue of this Article shall not be deemed on any subsequent occasion to be previous employment for the purpose of Article 3. Article 7 The competent authority may provide for the acceptance in substitution for a medical certificate of evidence in a prescribed form that the required certificate has been given. Article 8 Arrangements shall be made to enable a person who, after examination, has been refused a certificate to apply for a further examination by a medical referee or referees who shall be independent of any shipowner or of any organization of shipowners or seafarers. Article 9 Any of the functions of the competent authority under this Convention may, after consultation with the organizations of shipowners and seafarers, be discharged on delegating the work, or part of it, to an organization or authority exercising similar functions in respect of seafarers generally. Article 10 The formal ratifications of this Convention shall be communicated to the Director of the International Labour Office for registration. Article 11 1. This Convention shall be binding only upon those Members of the International Labour Organization whose ratifications have been registered with the Director. 2. It shall come into force six months after the date on which there have been registered ratifications by seven of the following countries : United States of America, Argentine Republic, Australia, Belgium, Brazil, Canada, Chile, China, Denmark, Finland, France, United Kingdom of Great Britain and Northern Ireland, Greece, India, Ireland, Italy, Netherlands, Norway, Poland, Portugal, Sweden, Turkey and Yugoslavia, including at least four countries each of which has at least one million gross register tons of shipping. This provision is included for the purpose of facilitating and encouraging early ratification of the Convention by Member States. 3. Thereafter, this Convention shall come into force for any Member six months after the date on which its ratification has been registered. Article 12 1. A Member which has ratified this Convention may denounce it after the expiration of ten years from the date on which the Convention comes into force, by an act communicated to the Director of the International Labour Office for registration. Such denunciation shall not take effect until one year after the date on which it is registered. 2. Each Member which has ratified this Convention and which does not, within the year following the expiration of the period of ten years mentioned in the preceding paragraph, exercise the right of denunciation provided for in this Article, will be bound for another period of ten years and, thereafter, may denounce this Convention at the expiration of each period of ten years under the terms provided for in this-Article.

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