63 STAT.] MULTILATERAL-TELECOMMUNICATIONS-OCT. 2, 1947 (App. 15 RR) c) If several radio direction-finding stations are grouped by means of special circuits, only one of them, the radio direction-finding control sta- tion, must be called even if all are furnished with transmitting apparatus. In that case, however, the mobile station must, if appropriate, specify in the call, by means of call signs, the radio direction-finding stations from which it wishes to obtain bearings. S8. The List of Radiolocation Stations contains infor- mation relating to: a) the type of signal and class of emission to be used for obtaining the bearings; b) the duration of the transmission to be made by the mobile station; and c) the time used by the radio direction-finding sta- tion in question, if different from Greenwich mean time (G.M.T .). Section II. Rules of Procedale §4. The following rules of procedure are based on the use of radiotelegraphy. For radiotelephony, appropriate phrases may replace the service abbreviations. 56. To obtain a bearing or course. (1) The mobile station calls the radio direction-finding station or the radio direction-finding control station on the lis- tening frequency indicated in the List of Radiolocation Sta- tions. Depending on the type of information desired, the call- ing station transmits the appropriate service abbreviation followed, if the radio dircction-finding station is a mobile station, by the service abbreviation QTIH? It indicates, if necessary, the frequency on which it is going to transmit to enable its bearing to be taken, and then awaits instructions. (2) The radio direction-finding station called requests the calling station, by means of the appropriate service abbre- 2101
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