Vessels sailing under the Uruguay 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 Uruguay Country Flag is represented by a depiction of the sun set in a white canton in the upper hoist quadrant. The sun has 16 rays protruding from it, eight rays being straight edged and appearing in the forward and eight rays being wavy, appearing to be recessed. The sun sports a human-like face in the main body. Nine equally proportioned, horizontal alternating sky blue and white stripes fill the remainder of the flag, white on both the top and bottom. The sun represents the Sun Of May, who is the Inca Sun God, also called Inti. The original nine departments of Uruguay are represented by the alternating stripes. The Uruguay Country Flag was officially adopted in 1830, coinciding with the signing of the country's Constitution.