Vice-Admiral of the Blue  The Vice-Admiral of the Blue was a senior rank of the Royal Navy of the United Kingdom, immediately outranked by the rank Vice-Admiral of the White (see order of precedence below). Royal Navy officers currently holding the ranks of commodore, rear admiral, vice admiral and admiral of the fleet are sometimes considered generically to be admirals. From 1688 to 1805 this rank was in order of precedence sixth; after 1805 it was the seventh. In 1864 it was abolished as a promotional rank. The command flag for an Vice-Admiral of the Blue is pictured opposite. The Navy Royal inaugurated squadron colours during the reign of Elizabeth I (1558-1603) to subdivide the English fleet into three squadrons. There were three classes of admirals and differentiated by using coloured flags.. In 1620 the official Flag ranks of Admiral, Vice Admiral, and Rear Admiral were legally established that arose directly out of the organisation of the fleet into three parts. In 1688 the official rank of Admiral of the Fleet was formally introduced  The Vice-Admiral of the Blue was a senior rank of the Royal Navy of the United Kingdom, immediately outranked by the rank Vice-Admiral of the White (see order of precedence below). Royal Navy officers currently holding the ranks of commodore, rear admiral, vice admiral and admiral of the fleet are sometimes considered generically to be admirals. From 1688 to 1805 this rank was in order of precedence sixth; after 1805 it was the seventh. In 1864 it was abolished as a promotional rank.. The Navy was divided into three squadrons Red, White and Blue in order of seniority. Admirals were appointed to these squadrons and therefore their rank and squadron split the seniority originally into 9 bands then later 10 with ‘Admiral of the Fleet' as senior to all others. Seniority was therefore from 1805 to 1864:  Seniority was therefore from 1688 to 1805:  Admirals without an appointment were colloquially referred to as Yellow Admirals. Ships of the Royal Navy flew the Ensign that coincided with the squadron of their commanding officer.