Section 6(2) in The Naval Ceremonial, Conditions Of Service And Miscellaneous Regulations, 1964
(2)A [21gun] [Substitued by S.R.O. 215, dated 4th May, 1978] salute shall be given to the President on his arrival in and departure from India on occasions notified as 'Public', by all Indian Naval Shipspresent in the port of arrival or departure, and by any ship on her arrival or departure, which may arrive at or leave that port during the stay of the President
