Section 347(a) in The Naval Ceremonial, Conditions Of Service And Miscellaneous Regulations, 1964
(a)Executive Branch(i)Midshipman to Acting Sub-Lieutenant. - An officer must have attained the minimum age of 21 and have a seniority of 21h years as Midshipman.(ii)Acting Sub-Lieutenant to Sub-Lieutenant. - An officer must have one year's seniority as Acting Sub-Lieutenant. Promotion shall be ante-dated to cover the period spent as an Acting Sub-Lieutenant.(iii)Sub-Lieutenant to Lieutenant. - An officer must have 3 years seniority as Sub-Lieutenant.(iv)Lieutenant to Lieutenant-Commander. - An officer must have 8 years seniority as Lieutenant in the Indian Naval Volunteer Reserve and hold a Naval Watchkeeping Certificate.
