2103 63 STAT.] MUITITLATERAL-TELECOMMUNICATIONS-OCT. 2 , 1947 (App. IS RR) viation, to transmit for the bearing. If necessary, it indicates the frequency to be used for this purpose and the number of times the transmission is to be repeated. (3) After having changed, if necessary, to its new transmitting frequency, the calling station transmits two dashes of approximately ten seconds each, followed by its call sign. It repeats this signal as often as the radio direction- finding station requires. (4) The radio direction-finding station determines the direction and, if possible, the sense of the bearing, and its classification [see (9)]. (5) If the radio direction-finding station is not satisfied with the operation, it requests the calling station to repeat the transmission described under (3). (6) The radio direction-finding station transmits the information to the calling station in the following order: a) the appropriate service abbreviation; b) three digits indicating the true bearing or the true course from the radio direction-finding sta- tion; c) class of bearing; d) time of observation; e) if the radio direction-finding station is mobile, its own position in latitude and longitude, pre- ceded by the service abbreviation QTH. (7) As soon as the calling station has received the result of the observation, if it is considered necessary to obtain confirmation, it repeats back the message. The radio direction- finding station then confirms that the repetition is correct or, if necessary, corrects it by repeating the message. When the radio direction-finding station is sure that the calling station has received the message correctly, it transmits the signal "end of work." The calling station repeats this signal as an indication that the operation is finished. (8) In the absence of information to the contrary, the calling station assumes that the sense of the bearing was determined. If the radio direction-finding station has not determined the sense, it indicates this in the information transmitted, or reports the bearing and its reciprocal.
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