text: a White Ensign (worn at the stern, or from the gaff or main yardarm when at sea);
  a Union Jack (worn at the ship's jackstaff at the bow when not underway or when the ship is dressed);
  a Masthead pennant (worn at the masthead, except when displaced by an admiral's flag or commodore's broad pennant).
  In addition, each principal command in the Royal Navy also has its own king's colour which is a variation of the White Ensign, with its dimensions altered to mirror those of the colours of infantry regiments. In the centre is the royal cypher of the reigning monarch within the Garter, surmounted by the crown.
  Unlike the colours of regiments in the Army, the king's colours of the Royal Navy are identical with no battle honours. The following units hold a king's colour of the Royal Navy:
  Naval Aviation Command (ACOS (AV)), HMS Heron)
  Submarine Command (CAPTFASFLOT), HMS Neptune)
  Fleet (CINCFLEET HQ)
  Britannia Royal Naval College
  Surface Flotilla (MWS, )
  Royal Naval Reserve (COMMARRES, )
  The Royal Fleet Auxiliary also holds a king's colour, unique for a civilian organisation. It is a variation of the RFA's Blue Ensign, with the dimensions altered to mirror the Royal Navy King's Colour. It has the same royal cypher in the centre.
  Europe