Flag of Hawaii in command of the H.M.S. Discovery. During the Visit Vancouver met with Kamehameha I and presented him with a Red Ensign. At this time Ireland was not part of a united kingdom which meant the union jack did not contain Saint Patrick's Cross. This version of the Red Ensign, as well as the current version which added the cross in 1801, was the unofficial flag of the Kingdom of Hawaii until 1816. An adviser to Kamehameha noted that the Union Flag could draw Hawaii into international conflict, as his kingdom could be seen as an ally of the United Kingdom,
Union Jack is permitted on land, but use of the unmodified flag at sea is restricted to military vessels. Unauthorised use of the flag in the 17th century to avoid paying harbour duties – a privilege restricted to naval ships – caused James's successor, Charles I, to order that use of the flag on naval vessels be restricted to His Majesty's ships "upon pain of Our high displeasure." It remains a criminal offence under the Merchant Shipping Act 1995 to display the Union Flag (other than the "pilot jack" – see below) from a British ship. Naval ships will fly the white