63 STAT.] MULTILATERALTELECOMMUNICATIONS-OCT. 2, 1947 (Chapter XI, art. 24 RR) (535539) aeronautical fixed, mobile, and radionavigation services. In this latter case the certificate states that the holder has successfully passed the tests relating to these special provisions. 535 g) Knowledge of the general geography, especially the principal maritime and air navigation routes, and the most important telecommunication routes. 536 h) If necessary, elementary knowledge of a language widely used in the international correspondence of the mobile service. Candidates must be able to express themselves in that language in a satisfactory manner both orally and in writing. Each government decides for itself the language or languages required. C. Radiotelegraph Operator's Special Certificate 537 § 12. (1) The radiotelegraph operator's special certificate is issued to candidates capable of correct transmission and cor- rect reception by ear of 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. These candidates must in addition be capable of correct transmis- sion and correct reception by telephone, except in the case provided for in 515. 538 (2) It rests with each government concerned to fix the other conditions for obtaining this certificate. However, except in the case provided for in 515, the conditions specified by 544, 545, 547 or 548, as the case may be, must be satisfied. D. Radiotelephone Operator's Certificate 539 § 13. The general radiotelephone operator's certificate is issued to candidates who have given proof of the knowledge 1807
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