In this section:
Once you have entered the required data it is a good idea to save your work. This may be done by selecting Save Measurement Data from the File menu. This will overwrite the original file. If you wish to save the new data with a new file name select Save Measurement Data As… from the File menu and type in a new file name.
Once you have saved measurement .data, these may be read back into SPAN using the File | Open command. This will read in the rig (and mizzen data), if you do not have a Maxsurf file open in SPAN, the hull data will also be read in automatically. If, however, you have a Maxsurf file open in SPAN, you will be asked if you want to close the design. If you choose “yes”, the hull data will be loaded (as well as the rig data) and the Maxsurf file closed; if you choose “no” the hull data will not be loaded from the file and you will be left with the original hull measurements. This is to facilitate analysis of the same hull with different sail sets, or to preform analysis on a hullform which has been modified.

Prompt when opening a SPAN data file (.spd) when a Maxsurf design is already open