For the purpose of this Chapter, unless expressly provided otherwise—
| (i) | a subdivision load line is a waterline used in determining the subdivision of the ship; |
| (ii) | the deepest subdivision load line is the waterline which corresponds to the greatest draught permitted by the subdivision requirements which are applicable; |
| (b) | the length of the ship is the length measured between perpendiculars taken at the extremities of the deepest subdivision load line; |
| (c) | the breadth of the ship is the extreme width from outside of frame to outside of frame at or below the deepest subdivision load line; |
| (d) | the draught is the vertical distance from the moulded base line amidships to the subdivision load line in question; |
| (e) | the bulkhead deck is the uppermost deck up to which the transverse watertight bulkheads are carried; |
| (f) | the margin line is a line drawn at least 76 millimetres (3 inches) below the upper surface of the bulkhead deck at side; |
| (g) | the permeability of a space is the percentage of that space which can be occupied by water; The volume of space which extends above the margin line shall be measured only to the height of that line; |
| (h) | the machinery space is to be taken as extending from the moulded base line to the margin line and between the extreme main transverse watertight bulkheads bounding the spaces containing the main and auxiliary propelling machinery, boilers serving the needs of propulsion, and all permanent coal bunkers; (In the case of unusual arrangements, the Administration may define the limits of the machinery spaces.); |
| (i) | passenger spaces are those which are provided for the accommodation and use of passengers, excluding baggage, store, provision and mail rooms; For the purposes of Regulations 4 and 5 of this Chapter, spaces provided below the margin line for the accommodation and use of the crew shall be regarded as passenger spaces; |
| (j) | in all cases volumes and areas shall be calculated to moulded lines. |
| (k) | The remote steering gear control system is the means by which required rudder movements are transmitted from the navigating bridge to the steering gear power unit controls. |
[Paragraph (k) inserted by Proclamation No. R. 168 of 1982]
| (l) | The main steering gear is the machinery, 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. |
[Paragraph (l) inserted by Proclamation No. R. 168 of 1982]
| (m) | The steering gear power unit is— |
| (i) | in the case of electric steering gear, an electric motor and its associated electrical equipment; |
| (ii) | in the case of electro-hydraulic steering gear, an electric motor and its associated electrical equipment and connected pump; |
| (iii) | in the case of other hydraulic steering gear, a driving engine and connected pump. |
[Paragraph (m) inserted by Proclamation No. R. 168 of 1982]
| (n) | The auxiliary steering gear is that equipment which is provided for effecting movement of the rudder for the purpose of steering the ship in the event of failure of the main steering gear. |
[Paragraph (n) inserted by Proclamation No. R168 of 1982]
