For the purposes of this part—
(a)
Position 1 means in an exposed position on—
(1)
The freeboard deck or a raised quarter deck;
(2)
A superstructure deck or a trunk deck and forward of a point 1/4L from the forward perpendicular; or
(3)
A trunk deck whose height is less than H
s.
(1)
On a superstructure deck aft of a point 1/4L abaft the forward perpendicular; or
(2)
On a superstructure and trunk combination, that is H
s or more n height, aft or a point 1/4L abaft the forward perpendicular.