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Rules concerning the Control of Wireless Telegraphy in Time of War and Air Warfare. Drafted by a Commission of Jurists at the Hague, December 1922 - February 1923.
First part: Rules for the Control of Wireless Telegraphy in Time of War. - Art. 9.
Art. 9. Belligerents are bound to conform to the rules contained in the International Conventions regarding distress signals and distress messages, so far as their military operations permit them to do so.
The provisions contained in the present regulations cannot dispense the belligerents from such obligation, or forbid the transmission of distress signals, distress messages and messages which are indispensable for the safety of navigation.