63 STAT.] MULTILATERAI-TELECOMMUNICATIONS-OCT. 2, 1947 (Chapter XIII, art. 33 RR) (721-726) craft desiring to enter into communication with a station of the maritime mobile service using frequencies in this band, is the frequency 500 kc/s. 721 (2) However, in order to reduce interference in regions of heavy traffic, administrations reserve the right to consider the requirements of 720 as satisfied when the calling frequen- cies assigned to coast stations open to public correspondence are not separated by more than 5 kilocycles from the general calling frequency 500 kc/s. 722 § 5. (1) The frequency for replying to a call sent on the general calling frequency (see 720) is the frequency 500 kc/s. the same as that of the call. 723 (2) However, in regions of heavy traffic, ship stations should, as far as possible, ask coast stations to answer by means of their normal working frequency (see 632). C. Traffic. 724 § 6. (1) Coast stations working in the authorized bands be- tween 405 and 535 kc/s must be able to use at least one fre- quency in addition to 500 kc/s. One of these additional fre- quencies which is printed in heavy type in the List of Coast and Ship Stations is the normal working frequency of the station. 725 (2) In addition to their normal working frequency coast stations may use, in the authorized bands, additional frequen- cies which are shown in ordinary type in the List of Coast and Ship Stations. The band of frequencies 405 to 415 kc/s, however, is assigned to radio direction-finding; it may not be used by the mobile service except on the conditions fixed by chapter III. 726 (3) The working frequencies of coast stations must be chosen so as to avoid interference with neighbouring stations. 1855
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