In Royal Navy
What are the differences between the Royal Navy flags 'royal ensign' 'red ensign' 'blue ensign' and 'white ensign'?
Answer . There are many rules governing the use of these ensigns under different circumstances and by ships of varying size, actions such as leaving harbour etc. Check the …Related Links for more info.. Answer . Red British ship receiving a signal by a British naval vessel, entering or leaving a foreign port, and if over 50 tons entering or leaving a British port. Blue merchantman commanded by a Naval Reservist Officer etc. White Only vessels of the Royal Navy or the Royal Yacht Squadron (plus the Trinity House vessel "Patricia" when escorting the Sovereign) are allowed to fly the white ensign at sea or in harbour. During times of war, R.N. vessels fly the Union Jack, and when going into battle, strike the jack and hoist the White Ensign, also known as "The Battle Flag ". Afterwards, the White Ensign is flown until the ship returns to her home port, when the Union Jack is re-hoisted as she enters harbour.. Royal The Royal Ensign is ONLY flown when the Monarch is aboard a vessel. ( Full Answer )