Chapter XIII.
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Chap. XIII, art. 33 RR) (713–720) Section II. Bands included between 405 and 535 kc/s 713 § 2. The provisions of this section are applicable to aircraft stations when communicating with stations of the maritime mobile service. *A.**Distress.* 714 § 3.
(1)The frequency 500 kc/s is the international distress frequency; it is used for this purpose by ship or aircraft stations using frequencies in the band 405 to 535 kc/s when requesting assistance from the maritime services. It is used for the distress call and distress traffic, and for urgency and safety signals and messages. 715
(2)In addition it may be used only: *a)* for call and reply (see 720 and 722); 716 *b)* by coast stations to announce the transmission of their traffic lists under the conditions provided for in 688. 717
(3)As an exception, however, the frequency 500 kc/s may be used for traffic, outside regions of heavy traffic, under the conditions provided for in 727, 728 and 729. 718
(4)Apart from the transmissions authorized on 500 kc/s, and taking account of 721, all transmissions on the frequencies included between 490 and 510 kc/s are forbidden. 719
(5)In order to facilitate the reception of distress calls, all stations working on the frequency 500 kc/s must reduce to the minimum their transmissions on this frequency. *B.**Call and Reply.* 720 § 4.
(1)The general calling frequency, which must be used by any ship station or coast station engaged in radiotelegraphy in the authorized bands between 405 and 535 kc/s, and by air- 63 Stat. 1854 (721–726) (
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