<i:< STAT I IMUt-TILATEIAL- -TELE(COIMMUNICATIONS()CT. 2 , 1947 (App. 15 RR) APPENDIX 15 Procedure for Obtaining Radio Direction-Finding Bearings and Positions (See article 44) Section 1. General Instructions §1. Before calling one or more direction-finding stations for the purpose of asking for a bearing or position, a mobile station must ascertain from the List of Radiolocation Stations: a) the call signs of the stations to be called to obtain the desired bearings or position; h) the frequency on which the radio direction-find- ing stations keep watch, and the frequency or frequencies on which they take bearings; c) the radio direction-finding stations which, being linked by special circuits, can be grouped with the radio direction-finding station to be called. §2. The procedure to be followed by the mobile station depends on varying circumstances. Generally, the following must be taken into account: ' a) If the radio direction-finding stations do nit keep watch on the same frequency (whether it be the frequency on which bearings are taken or another frequency), a separate request for the bearings must be made to each station or group of stations using a given frequency. b) If all the radio direction-finding stations con- cerned keep watch on the same frequency, and if they are able to take bearings on a common fre- quency (which may be different from the listen- ing frequency), the mobile station must call all of them at the same time, in order that these stations may take simultaneous bearings on the same transmission. 2099
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