Regulations for the Navy Part IIICentral Regulations · 1957
Colours shall be worn at all launchings of Indian Naval Ships whether Dockyard or Contract built, at which there is a Naming Ceremony; the White Ensign shall be worn at the Ensign Staff and the National Flag at the Jackstaff. It shall not be necessary to hoist any other flag.
The largest reasonable size flag should be worn, the following being taken as a guide:-
(a) Light Fleet and Escort Carriers and Cruisers- Ensign . . . . 12 Breadths National Flag . . . . 8 Breadths
(b) Destroyers and Smaller Craft- Ensign . . . . 8 Breadths National Flag . . . 6 Breadths