63 STAT.] MULTILATERAL-TELECOMMUNICATIONS-OCT. 2 , 1947 (Chapter XI, art. 24 (R) (530534) apparatus used for radio direction-finding and the taking of direction-finding bearings, as well as elementary knowledge of the principles of operation of other apparatus in general use for radionavigation. 530 b) Elementary theoretical and practical knowledge of the operation and maintenance of apparatus, such as motor-generators, storage batteries, etc., used in the operation and adjustment of the radiotelegraph, radiotelephone and radio direc- tion-finding apparatus mentioned in 529. 531 c) Practical knowledge sufficient for effecting repairs in the case of minor damage which may occur to the radiotelegraph, radiotelephone and radio direction-finding apparatus during a voy- age. 532 d) Ability to send correctly and to receive correctly by ear, code groups (mixed letters, figures and punctuation marks) at a speed of 16 (sixteen) groups a minute. Each code group must comprise five characters, each figure or punctuation mark counting as two characters. The duration of each test of sending and of receiving is, as a rule, five minutes. 533 e) Ability to send correctly and to receive correctly by telephone except in the case provided for in 515. 534 f) Knowledge of the Regulations applying to radio- communications, knowledge of the documents relating to charges for radiocommunications, knowledge of the provisions of the Convention for the Safety of Life at Sea which relate to i 5 stat. 121 . radio, and, in the case of air navigation, knowl- edge of the special provisions governing the 1805
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