Vessels sailing under the Sudan Country Flag are required to have on board this flag as part of flag state requirements that derive from maritime regulations in the International Code of Signals and the International Safety Management (ISM) Code. These codes are published by the International Maritime Organization (IMO) as an ongoing effort to reinforce maritime safety procedures and communications to the international maritime community. Fleet management companies and ship owners are responsible to ensure that each vessel in their respective fleets have the appropriate flag signage onboard to be in compliance. This flag is used to identify the flag state a vessel is sailing under and to communicate with other vessels under the provisions of the International Code of Signals.
The Sudan Country Flag may be recognized by it's three equally proportioned horizontal stripes of red, white and black, respectively from top to bottom. A green isosceles triangle dominates the hoist, or left side of the flag, pointing toward the fly, or right side. The red symbolizes Sudan's struggle for freedom and the martyrs who sacrificed their lives for it. The white stripe is reminiscent of the White Flag League. These rebels rose up against outsiders in the 1920s. Black is the color of Sudan, as the words have the same meaning in the Arabic language. It may also represent the black flag used to identify nationalists during the Mahdist revolution. While the green directly represents Islam, Sudan's national religion, all the colors of the flag are symbolic of Arab states and Islamic philosophy. Based on the Arab Liberation Flag of Egypt, the Sudan Country Flag was officially accepted as a national symbol in 1970. The change was a result of a 1969 military coup. It is designated to hold a proportional ratio of 1:2, height to length, respectively.