Vessels sailing under the Thailand 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 Thailand Country Flag is represented by a series of horizontal stripes. A red stripe on top and one on the bottom sandwich two white stripes of equal proportions to the red. A larger Blue stripe is centered vertically on the flag between the white stripes. The Thailand Country Flag was formally adopted in 1917. The colors represent Thailand in that the Blue is the official National Color. It represents the Thai monarchy. It is also said to represent a tribute to the Allied Forces who fought in World War One, those of whom had previously incorporated the colors of red, white and blue into their respective national flags. White is meant to represent purity. It is representative of the ancient philosophy of Buddhism, Thailand's most prominent nationally recognized religion. Purity and clarity are important themes in Buddhism. The red stripes are designed to pay tribute to the blood of life that all the population shares through common belief and history. The Thailand Country Flag is designated to be proportioned at a ratio of 2:3, height to length, respectively.