Section 61(b) in The Naval Ceremonial, Conditions Of Service And Miscellaneous Regulations, 1964
(b)in one Indian Naval Ships for passage-the proper distinguishing flag, with the approval of the Senior Naval Officer, may similarly be hoisted and be kept flying within the limits of the respective Government, Mission or Command, provided the functionary be proceeding on the public service. The distinguishing flag of Consular Authorities shall be hoisted in boats only and not in ships, except when they are being saluted;
