equivalence. Clause (1) of Regulation 247 provides that the crews of Indian Naval Ships shall rank and command after Naval Cadets according to Regulation 247. Clauses (1) to (3) of Regulation 247 are relevant, which read thus: “247. (1) The crews of Indian Naval Ships shall rank and command after Naval Cadets according to this Regulation. (2) Any sailor of any one of following ranks shall rank and command before any sailor of a rank below it in the following list, except that sailors exercising Military Command rank and command before all sailors placed under their command:- Chief Petty Officer Petty Officer Leading Seaman Able Seaman Ordinary Seaman Boy Seaman (3) Sailors belonging to any one of the ranks mentioned in sub-regulation (2) shall rank and command among themselves according to their seniority in that rank provided that: (a) Chief Engine-Room Artificers, Chief Ordnance Artificers, Chief Electrical Artificers, Chief Shipwright Artificers, Chief Aircraft Artificers. Chief