54 STAT.] MULTILATERAI-TEELECOMMUNICATION-APR 8, 1938 distress, may impose silence either to all the stations of the mobile service in the zone, or to any one station which may be causing interference with the distress traffic. In both cases, the regulatory abbreviation (QRT) shall be used, followed by the word DISTRESS; these indications shall be addressed "to all" stations or to one station only, as the case may be. The use of the abbreviation QRT must be reserved, so far as possible, for the ship in distress and for the station which is directing the distress traffic. [575] (2) When the station in distress wishes to impose silence, it shall use the above-mentioned procedure, substituting the distress signal ... - ... for the word DISTRESS. [576] §16. (1) Any station hearing a distress call must conform to the provisions of §5 (4) [No. 555]. [578] (2) Any station of the mobile service which becomes aware of distress traffic must listen to this traffic even if it is not taking part in it. [579] (3) For the entire duration of distress traffic, it shall be pro- hibited for all stations which are aware of this traffic and which are not taking part in it: [580] (a) to use the distress wave [500 kc (600 m)] or the wave on which the distress traffic is taking place; [581] (b) to use type-B waves. [582] (4) A station of the mobile service which, while following distress traffic of which it is aware, is able to continue its normal service, may do so, when the distress traffic is well established, under the following conditions: [583] (a) the use of the waves specified in (3) [Nos. 579 to 581] shall be forbidden; [584] (b) the use of type-Al waves, with the exception of those which might interfere with the distress traffic, shall be permitted; [585] (c) it shall be allowed to use type-A2 or -A3 waves only in the band or bands allocated to the mobile service and which do not include frequencies used for distress traffic [the band around 500 kc (600 m) extends from 385 to 550 kc (779 to 545 m)]. [586] §17. When it is no longer necessary to observe silence, or when the distress traffic is ended, the station which has controlled this traffic shall send on the distress-wave, and, where necessary, on the wave used for this distress traffic, a message addressed "to all", in- dicating that the distress traffic is ended This message shall take the following form: the distress signal, CQ call "to all" (three times), the word DE, call signal of the station transmitting the message (once), time of filing of the message, name and call signal of the mobile station which was in distress, abbreviation "QUM". 1541
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