Definitions

(1) With respect to such ships as the Administration considers unable or unnecessary to meet the requirements of this Part these requirements shall apply for the safety of those ships and persons on board as far as is deemed necessary by the Administration. (2) For the purposes of this Part, unless expressly provided otherwise“auxiliary means of steering” means the arrangements capable of steering the ship either manually or by power in the event of failure of the main steering gear but not including its tiller, quadrant or components serving the same purpose; “emergency source of electrical power” means a source of electrical power intended to supply the services in the event of failure of the supply from the main source of electrical power; “margin line” means a line drawn at least 76 mm below the upper surface of the bulkhead deck at side; “main source of electrical power” means a source intended to supply electrical power to the main switchboard for distribution to all services necessary for maintaining the ship in normal operational habitable conditions; “main steering gear” means the machinery, rudder actuators, the steering gear power units, if any, and ancillary equipment and the means of applying torque to the rudder stock (e.g. tiller or quadrant) necessary for effecting movement of the rudder for the purpose of steering the ship under normal service conditions; Merchant Ships (Registration) 125 “maximum ahead service speed” means the greatest speed which the ship is designed to maintain service at sea at its deepest seagoing drought; “maximum astern speed” means the speed which it is estimated the ship can attain at the design maximum astern power at its deepest seagoing draught; “offshore supply vessel” means a cargo ship propelled by (a) whose primary use is the transport of stores, materials and to offshore installations and which may also be used for the laying of anchors, towage of offshore installations; and (b) which is designed with accommodation and bridge erections in the forward part of the vessel and exposed cargo deck in the after part for the handling of cargo at sea; “superstructure” means the decked structure on the freeboard deck extending from side to side of the ship or with the side plating not being inboard of the shell plating more than 0.04B, where B is the maximum breadth of the ship measured amidships to the moulded line of the frame in a ship with a metal shell and the outer surface of the hull in a ship with a shell of any other material; “watertight” means capable of preventing the passage of water through the structure in any direction under a head of water for which the surrounding structure is designed; “weathertight” means that in any sea condition water will not penetrate into the ship.