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Fig. 1: Model of identity card (format: 74 mm x 105 mm)
Chapter II. THE DISTINCTIVE EMBLEM
Article 3
Shape and nature
1. The distinctive emblem (red on a white ground) shall be as large as appropriate under the circumstances. For the shapes of the cross, the crescent or the lion and sun, the High Contracting Parties may be guided by the models shown in Figure 2.
2. At night or when visibility is reduced, the distinctive emblem may be lighted or illuminated; it may also be made of materials rendering it recognizable by technical means of detection.
Fig. 2: Distinctive emblems in red on a white ground
Article 4
Use
1. The distinctive emblem shall, whenever possible, be displayed on a flat surface or on flags visible from as many directions and from as far away as possible.
2. Subject to the instructions of the competent authority, medical and religious personnel carrying out their duties in the battle area shall, as far as possible, wear headgear and clothing bearing the distinctive emblem.
Chapter III. DISTINCTIVE SIGNALS
Article 5
Optional Use
1. Subject to the provisions of Article 6 of these Regulations, the signals specified in this Chapter for exclusive use by medical units and transports shall not be used for any other purpose. The use of all signals referred to in this Chapter is optional.
2. Temporary medical aircraft which cannot, either for lack of time or because of their characteristics, be marked with the distinctive emblem, may use the distinctive signals authorized in this Chapter. The best method of effective identification and recognition of medical aircraft is, however, the use of a visual signal, either the distinctive emblem or the light signal specified in Article 6, or both, supplemented by the other signals referred to in Articles 7 and 8 of these Regulations.
Article 6
Light signal
1. The light signal, consisting of a flashing blue light, is established for the use of medical aircraft to signal their identity. No other aircraft shall use this signal. The recommended blue colour is obtained by using, as trichromatic co-ordinates:
green boundary y = 0.065 + 0.805x
white boundary y = 0.400 - x
purple boundary x = 0.133 + 0.600y
The recommended flashing rate of the blue light is between sixty and one hundred flashes per minute.
2. Medical aircraft should be equipped with such lights as may be necessary to make the light signal visible in as many directions as possible.
3. In the absence of a special agreement between the Parties to the conflict reserving the use of flashing blue lights for the identification of medical vehicles and ships and craft, the use of such signals for other vehicles or ships is not prohibited.
Article 7
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 paragrap
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