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Convention (II) for the Amelioration of the Condition of Wounded, Sick and Shipwrecked Members of Armed Forces at Sea. Geneva, 12 August 1949.
Marking of hospital ships and small craft
The ships designated in Articles 22
shall be distinctively marked as follows:
(a) All exterior surfaces shall be white.
(b) One or more dark red crosses, as large as possible, shall be painted and displayed on each side of the hull and on the horizontal surfaces, so placed as to afford the greatest possible visibility from the sea and from the air.
All hospital ships shall make themselves known by hoisting their national flag and further, if they belong to a neutral state, the flag of the Party to the conflict whose direction they have accepted. A white flag with a red cross shall be flown at the mainmast as high as possible.
Lifeboats of hospital ships, coastal lifeboats and all small craft used by the Medical Service shall be painted white with dark red crosses prominently displayed and shall, in general, comply with the identification system prescribed above for hospital ships.
The above-mentioned ships and craft, which may wish to ensure by night and in times of reduced visibility the protection to which they are entitled, must, subject to the assent of the Party to the conflict under whose power they are, take the necessary measures to render their painting and distinctive emblems sufficiently apparent.
Hospital ships which, in accordance with Article 31
, are provisionally detained by the enemy, must haul down the flag of the Party to the conflict in whose service they are or whose direction they have accepted.
Coastal lifeboats, if they continue to operate with the consent of the Occupying Power from a base which is occupied, may be allowed, when away from their base, to continue to fly their own national colours along with a flag carrying a red cross on a white ground, subject to prior notification to all the Parties to the conflict concerned.
All the provisions in this Article relating to the red cross shall apply equally to the other emblems mentioned in Article 41
Parties to the conflict shall at all times endeavour to conclude mutual agreements, in order to use the most modern methods available to facilitate the identification of hospital ships.