54 STAT.] MULTILATERAL-TELECOMMUNICATION-APR. 8 , 1938 [482] §4. Traffic [483] (1) Coast and ship stations working within the authorized bands between 365 and 515 kc (822 and 583 m) must be able to use at least one wave besides that of 500 kc (600 m); when an additional wave is printed in heavy type in the nomenclature, this is the normal working-wave of the station. The additional waves thus chosen for coast stations may or may not be the same as those of ship stations. In any case, the working-waves of coast stations must be chosen in such a way as to avoid interference with neighboring stations. [484] (2) Besides their normal working-waves, printed in heavy type in the nomenclature, land and on-board stations may use, in the authorized bands, supplementary waves which shall be mentioned in the nomenclature in ordinary print. However, the band of frequen- cies from 365 to 385 kc (822 to 779 m) shall be reserved to the radio direction-finding service; it can be used by the mobile service, for radiotelegraph correspondence, subject only to the conditions set forth in article 7. At. p. 14i [485] (3) As an exception, on condition that no interference will result therefrom for distress, urgent and safety, calling and reply signals, the wave of 500 kc (600 m) may also be used: [486] 'a) in regions of heavy traffic, exclusively by ship stations and only for the transmission of a single and short radiotelegram; 1 2 [487] (b) in other regions, for the transmission of radiotelegrams and for radio direction-finding, but with discretion. [488] (4) In regions of heavy traffic of the European coasts, ship stations working with type-A2 waves in the band of 365 to 550 kc (822 to 545 m), must use, to the extent possible, the frequencies of 425 ke (706 m) and 480 kc (625 m). [489] (5) No European coast station shall be authorized to use these frequencies. [492] §5. Watch [493] (1) In order to increase safety of life at sea (ships), and over the sea (aircraft), all the stations of the maritime mobile service which normally listen on the waves of the authorized bands between 365 and 515 kc (822 and 583 m) must, during their working hours, make the necessary provisions to insure the watch on the distress- wave [500 kc (600 m)] twice per hour, for 3 minutes, beginning at x:15 and at x:45 o'clock, Greenwich mean time (G.M .T.) [490] 1 The regions of heavy traffic are indicated in the nomenclature of coast stations. These regions consist of the service areas of the coast stations indi- cated as not accepting traffic on 500 ke (600 m) (see appendix 9). [491] 2 In principle, such use shall be permitted only for ship stations provided with a break-in device or an equivalent apparatus. 1525
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