(6 STAT.] MUALTILATERAL-TELECO()MMUNICATI(NS-OCT. 2 , 1947 (Chapter XVI, art. 44 RR) (1019-1025) tion furnished is normal'y reliable. This information is pub- lished in the List of Radiolocation Stations, and the Secretary General of the Union is notified of any change of a permanent nature. 1019 § 4. The method of identification of radiolocation sta- tions must be so chosen as to avoid any doubt when it is neces- sary to identify a station. 1020 § 5. Signals sent by radiolocation stations must permit accurate and precise observations. 1021 § 6. Any information concerning modification or irregu- larity of working of a radiolocation station must be notified without delay in the following manner: 1022 a) Land stations of countries operating a radio- location service send out daily, if necessary, notices of modifications or irregularities in working until such time as normal working is restored or, if a permanent alteration has been made, until such time as it can reasonably be taken that all navigators interested have been warned. 1023 b) Permanent alterations or irregularities of long duration are published as soon as possible in the relevant notices to navigators. 1024 § 7. In the case where radiocommunication by telegra- phy or telephony is part of a radiolocation service, such com- munication will be subject to the provisions of these Regula- tions. Section II. Service of Radio Direction-Finding Stations 1025 § 8. In the maritime radionavigation service the fre- quency normally used for direction-finding is 410 kc/s. All direction-finding stations of the maritime radionavigation service must be able to use this frequency. They must, in addi- tion, be able to take bearings on the frequency 500 kc/s espe- 1951
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