ICRC databases on international humanitarian law
Treaties and Documents
1949 Conventions and Additional Protocols, and their Commentaries
Historical Treaties and Documents
Annex I (to Protocol Additional I to the Geneva Conventions of 1949) : Regulations concerning identification, 6 June 1977
Other means of communication
-- Other means of communication
When two-way radiocommunication is not possible, the signals provided for in the International Code of Signals adopted by the Inter-Governmental Maritime Consultative Organization or in the appropriate Annex to the Chicago Convention on International Civil Aviation of 7 December 1944, as amended from time to time, may be used.