Section 105(9) in The Naval Ceremonial, Conditions Of Service And Miscellaneous Regulations, 1964
(9)Painting of ship's boats.(a)The barge and any other personal boats of the Chief of the Naval Staff Shall be painted green.(b)The barge and any other personal boats of other Flag Officers shall be painted blue.(c)Except for restrictions in (a) and (b) above, boats may be painted any colour or combination of colours at the discretion of the Captain, subject to the approval of the Senior Officer.(d)Salute and marks of respect in boats shall be in accordance with Regulation 107.