Section 187(2)(c) in The Naval Ceremonial, Conditions Of Service And Miscellaneous Regulations, 1964
(c)(i)have served for not less than six years since being rated Acting Artificer 4th class, of which 31h years must have been in a sea-going ship.(ii)Mechanician-have served for not less than 2 years in a sea-going ship as a mechanician after completion of the Mechanician course;