I have defined a shape using LOCUS statements and added it to the
hull with the Fit Hull statement. We seem to have a bad station
and the shape will not fit right.
The shape not fitting is due to the bottom not having a definite
overlap. It is good practice to avoid lines which are coincident
between the component being fitted and the component being fitted
to. In this case the bottom of WBT6.S and HULL.C both have horizontal
line segments at 0.0 above the baseline. If you change the 0.0 on
WBT6.S to slightly negative it avoids this problem.