IXTERX;\TJONAL RADIO CONVENTION. NovEMnER 25, 1927. (3) The service of aeronautical stations shan be continous during the entire period of flight in th9 sector or sectors of the route or routes, for which the 8tation is question carries on the service of radio communications. Ship stations §2. (1) From the point of view of the international service of public correspondence, ship stations sLall be divided into three classes: 1st class: stations carrying on a continuous service. 2nd class: stations carrying on a designated service of limited duration. 3rd class: stations, whose duration of service is less than that specified for the stations in the second class and stations whose duration of service is undetermined. (2) The provisions of section 1, paragr.1ph 2, of the present Article shall apply strictly to ship stations, so fat as concerns distress service and, so far as practicable, in conformity with the spirit of the provi- sions of (2) of the said paragraph. (3) It shall be the duty of each of the contracting Governments to ensure the effectiveness of the service in ship stations of its nationality by requiring the presence in such stations of the necessary number of operators, aCCO ' lnt being taken of its own legislation on this subject. (4c) During navigation, ship stations of the second class must carry on service as follows: (a) In the case of short voyages, during the hours fixe:! by the Administratiun to which they are subject; (b) In other cases, at least during the hours assigned to them in Appendix 5. Mention of these hours shall be made in the license. Aircraft stations §3. Aircraft stations shall be divided ir +0 two classes: 1st class: stations carrying on service during the entire period of flight. 2nd class: stations not having fixed hours of service. §4. So far as concerns the international service of publie corre- spondence of mobile stations, the personnel of t.hese stations must include at least: _ (a) For mobile stations of the 1st class, an operator holding a 1st class certificate. (b) For mobile stations of the 2nd class, an operator holding a 1st or 2nd class cerLificate. (c) For mobile stations of th,- 3rd class, an operator who has passed the examination for the 2nd class certificate. ARTICLE 21 Information to appear in tM license The Government which issues the license to a ship station or air- craIt station shall mention therein the class in which it is placed. For a ship station in the second class, the license shall also mention the period of service assigned to the station in conformity with . Appendix 5. ARTICLE 22 Address of railiotelegrams §1. The address of radiotelegrams destined for mobile stations must be as complete as possible; it must be composed of the following: (a) Name or designation of the addressee, wi.th any additional information, if necessar.f . 2873 Ship stations. Aircraft stations. Inrormatlon toappear in the license. Address or radiotel&- grams.
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