The Indian Navy (IN) has one Naval Dockyard (ND) each at Mumbai and Visakhapatnam and one Naval Ship Repair Yard (NSRY) each at Kochi, Port Blair and Karwar. The repair and refit requirements of IN ships and submarines are collectively met by the above mentioned repair agencies. NDs have the capacity and capability to handle Major Refits (MR). The Operational-cum-Refit cycle of each ship / class of ship is promulgated by IHQ MoD (N) from time to time.