TELECOMMUNICATION CONVENTION. DECEMBER 9,1932. [3UI] § 4. (1) When communication is first established with a land station, every mobile station, if it deems it advisable on. account of possible confusion, can transmit its name spelled out as it appears in the nomenclature. [317] (2) The land station can, by means of the abbreviation PTR, request the mobile station to give it the following information: (a) approximate distance in nautical miles and bearing with reference to the land station, or else the position indicated by latitude and longitude; (b) next port of call. [318] (3) The information covered by subparagraph (2) shall be furnished by authorization of the commander or the person re- sponsible for the vehicle carrying the mobile station and only in case it is requested by the land station. [319] § 5. In communications between land stations and mobile sta- tions, the mobile station shall comply with the instructions given by the land station, in all questions relative to the order and the time of transmission, to the choice of frequency (wavelength) and/or of the type of wave and to the suspension of work. This provision shall not apply to cases of distress. [320] § 6. In communications between mobile stations, and except for cases of distress, the station called shall control the work as indicated in §5 above. [321] § 7. (1) When a station called does not answer a call sent three times, at intervals of 2 minutes, the call must cease and it may be resumed only 15 minutes later (5 minutes for aeronautical mobile service). The calling station, before resuming the call, must make certain that the station called is not in communication with another station at that time. [322] (2) The call may be repeated at shorter intervals if there is no danger that it will interfere with communications in progress. [323] § 8. When the name and the address of the operating agency of a mobile station are not shown in the nomenclature or are no longer in accord with the data given therein, it shall devolve upon the mobile station, as a matter of routine, to furnish the land station to which it sends traffic with all the necessary information in this connection, using for this purpose the appropriate abbreviations. ARTICLE 19 Use oj Waves in the Mobile Service 2513 [324] § 1. (1) In the bands included between 365 and 515 kc (822 bi~:'r~l~ava< in mo- and 583 m), the only type-B waves permissible shall be the following: 375,410,425,454, and 500 kc (800,730,705,660, and 600 m). r26] (2) The general calling-wave which must be used by all ship stations and by all coast stations working in radiotelegraphy in the authorized bands between 365 and 515 kc (822 and 583 m), as
