The data export function in Hydromax is similar to Maxsurf. Some Hydromax-specific export features are described below.

Data export dialog in Hydromax.
Contains all lines displayed in the active design window as closed poly-lines. In addition, each tank, compartment and non-buoyant volume is exported on a separate layer. This export function is particularly useful to export tank arrangement drawings.
Note:
The layer name is the same as the compartment name, so it is important to have unique compartment names.
For more information on data export of DXF and IGES, please see the “Output of Data” section in the Maxsurf manual.
After Hydromax version 8, a major change to the Hydromax file structure was made. Hydromax models created in versions greater than version 8.0 can be exported using the File | Export menu so that it is compatible with Hydromax version 8.0. All key points will become downflooding points in the version 8 file and any tank sounding pipe information will be lost.