Section 6(3) in The Naval Ceremonial, Conditions Of Service And Miscellaneous Regulations, 1964
(3)Whenever the President shall embark in any ship of war, the [National flag] [Substitued by S.R.O. 17E, dated 5th July, 1967] shall be hoisted at the main, and the National Flag at the [fore] [Substitued by S.R.O. 348, dated 20th September, 1978] of such ship; or if on board a vessel with less than two masts, they shall be hoisted in the most conspicuous part of her. Should however, the President go on board for a short visit, the [National flag] [Substitued by S.R.O. 17E, dated 5th July, 1967] only shall be hoisted.A [21 gun] [Substitued by S.R.O. 215, dated 4th May, 1974] salute shall also be fired from a ship or vessel on the President going on board and again on leaving her; and every one of Indian Naval Ships present shall likewise fire a [21 gun] [Substitued by S.R.O. 215, dated 4th May, 1974] salute on the hoisting of those flags, and such further 3[21gun] salutes shall be fired on the President quitting the ship or vessel or passing in a boat or on such other occasions as may be directed.
