With consecutive numbers beginning from the deepest subdivision load line, which must be marked C1.
The subdivision load lines must be identified with the letter C, and, in ships of Classes I and II, with consecutive numbers beginning from the deepest subdivision load line which must be marked C1. A Class II ro-ro passenger ferry might, for example, have two subdivision load lines: C1 and C2. At C1 she might be certified to carry (in the “principal passenger condition”) up to 600 passengers and 60 crew, while at C2 (an “alternative condition” which gives a greater freeboard) she might be allowed to carry 900 passengers and 60 crew. The line to be used will depend on the passenger spaces in use.