Vessels sailing under the Denmark 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 flag of Denmark features a bold, red flag with a white cross dissecting the flag slightly off center. The official name of the flag is Dannebrog and the proportions of the flag can slightly vary, at 28 by 34 all the way to 28 by 37. The flag itself has been around since the year 1400, although it was officially accepted and adopted as the national flag in 1748 and then was approved for private use in 1854.
The horizontal white stripe portion of the flag perfectly cuts through the middle of the flag. In some variations, there are two corner extensionof the flag where each of the non-hoist corners extend further out, then come back towards the main portion of the flag where the white, horizontal line comes to the end. As for the slightly off center vertical line, it is closer to the hoist side, which allows government officials and those displaying the flag to know which end of the flag should come in contact with the flag pole or hang from the housing unit.