Section 122(8)(a) in The Naval Ceremonial, Conditions Of Service And Miscellaneous Regulations, 1964
(a)Those holding Certificate of Competency as a Master or a Mate shall be entered as Acting Lieutenant. Suitably qualified candidates who are in possession of a Certificate of Competency as a Master, may be granted up to a maximum of 2 years seniority in the rank of Lieutenant, at the discretion of the Chief of the Naval Staff. I'