Despite the earliest depictions of a Dannebrog at sea date back to 15th century, it was in 1625 when the Danish King Christian IV issued the known rules of flying the flag and flying the Colors of Command in the navy, that would last with little changes until the 1940 Nazi invasion.
Sources: Danish Naval History website:The Naval Ensign | Flags of The World (FOTW) website:Danish Naval Flags
Sizes: ensign W12 x L23 mm, mast flags W8 x L12 mm & W8 x L15 mm, jack W6 x L11 mm, pennant W4 x L48 mm.
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