IXTERXATIONAL nADIO C0XVEX'l'IOX. NOYE)1BER 25,1927. (2) In all cases, mobile stations which, during this transmission, hear their call signal must answer so soon as practicable, complying with provisions of section 1, and following so far as practicable the order in which they were called. The time at which land stations transmit their traffic lists as well as the frequencies and types of waves which they use for this purpose shall be indicated in the nomenclature. (3) The land station shall inform each mobile station concerned of the frequency Ilnd type of wave to be used for work with it, as well as of the approximate time at which the traffic may becin. §3. When a land station receives calls from several mobile station~ at practically the same time, it shall decide the order in which these stations may transmit their traffic to it, its decision being based only on the requirement of p'ermitting each calling station to exchange with it the greatest pOSSIble number of radiotelegrams. §4. (1) When a land station answers It call from a mobile station it may, if deemed necessary-, ask the mobile station, by means oi appro- priate abbreviations, to mdicate the number of radio telegrams on hand. (2) If information concerning the position, route, speed or ports of call of the ship, aircraft or other mobile station appears necessary to the land station, the latter asks for it by means of a free service advice, addressed to the master, or to the person in charge of the ship, aircraft or other mobile station who furrushes it or not at his discre- tion. The mobile station must give such information to the land station only when it has been requested and furnished as stated above. §5. In communication between coast and mobile stations, the mobile stations Ehall follow the instructions of the coast station, in all questions relating to the order and time of transmission, as well as to the suspension of work. This provision shall not apply to cases of Jistress. §6. In communication between mobile stations, except in cases of distress, the station called shall control the work as indicated in section 5 above . • , §7. (1) When a station called does not answer to a call sent threl_~ -w nes at intervals of two minutes, the call must cease and it may be resumed only after an interval of fifteen minutes. The cailing station, before resuming the call, must make certain that the station called is not at that moment in communication with another station. (2) The call may be repeated at shorter intervals if it is not likely to interfere with communications in progress. §8. When the name and address of the management of a mobile station are not shown in the nomenclature or are no longer in accord - w'ith the data given in the latter, it devolves upon the mobile station to furnish the land station to which it sends traffic all the necessary information, using for this purpose the appropriate ahbreviations. ARTICLE 25 Time of.filing radiotelegrams §1. To indicate the time of filing radio telegrams nccepted in mobile stations, the person in charge shall employ Greenwich Menn Time, and s~all use a notation according to the twenty-four hour system. This time shall always be expressed and sent by means of four figures (0000 to 2359). §2. The Administrations of countries located outside zone "A" (Appendix 6), however, may authorize ship stations following the coasts of their countries to use zone time to indicate, by a group of four figures, the time of filing, and in this case the group must be followed by the letter F. 2875 Time or filing rad;c telegrams. Poal, p. 2895.