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Annex I (to Protocol Additional I to the Geneva Conventions of 1949) : Regulations concerning identification, 6 June 1977
-- Radio signal
1. The radio signal shall consist of a radiotelephonic or radiotelegraphic message preceded by a distinctive priority signal to be designated and approved by a World Administrative Radio Conference of the International Telecommunication Union. It shall be transmitted three times before the call sign of the medical transport involved. This message shall be transmitted in English at appropriate intervals on a frequency or frequencies specified pursuant to paragraph 3. The use of the priority signal shall be restricted exclusively to medical units and transports.
2. The radio message preceded by the distinctive priority signal mentioned in paragraph 1 shall convey the following data:
(a) call sign of the medical transport;
(b) position of the medical transport;
(c) number and type of medical transports;
(d) intended route;
(e) estimated time en route and of departure and arrival, as appropriate;
(f) any other information such as flight altitude, radio frequencies guarded, languages and secondary surveillance radar modes and codes.
3. In order to facilitate the communications referred to in paragraphs 1 and 2, as well as the communications referred to in Articles 22
of the Protocol, the High Contracting Parties, the Parties to a conflict, or one of the Parties to a conflict, acting in agreement or alone, may designate, in accordance with the Table of Frequency Allocations in the Radio Regulations annexed to the International Telecommunication Convention, and publish selected national frequencies to be used by them for such communications. These frequencies shall be notified to the International Telecommunication Union in accordance with procedures to be approved by a World Administrative Radio Conference.