POSEIDON’s “hull wizard” modules automatically generate the typical structural arrangement of the midship sections of containerships, tankers and bulk carriers, Fig. 1. Wizards are intelligent macros that allow setting up hull geometry by defining a few basic parameters or by importing hull form data. Similarly, tank arrangements and load data can be user-defined or automatically generated. The functional elements describing the hull geometry are automatically adapted to adjoining structures and hull contours but the designer is free to arrange the layout of plates, stiffener type and spacing, as well as other components.