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Each hull has a nominal centre point (x = si, y = wi, z = 0). The centre of the main hull, hull 1, is always located at the origin. The centres of all other hulls are then measured relative to the main hull, i.e. to hull 1. si is the longitudinal separation distance of the i'th hull measured relative to the first hull and is defined as positive astern. Hence by definition, s1 = 0. wi is the lateral separation distance of the i'th hull relative to the first hull (positive to starboard). Hence by definition, w1 = 0. For example, in the arrangement shown in Figure 3.1, s2 has a negative value, and w2 is positive; for hull 3, s3 is negative and w3 is positive.