:-) The offset system has the upside that the string of numbers doesn't take up much space in a column, which lets them fit the offsets for most of a boat (minus the stems) on a single page.

The part that is weirding me out is that offsets for station 1 and 13 (right at the ends of the boat) aren't given. The stations are there in the illustration, but no figures are given for drawing them.