I notice that when I select a Defense of 0 the Used SU and Remaining SU boxes display as #N/A.
If I convert a ship from Starmada with Shields 0 this should be a Defense of 1 but that is not an option (presumably as it is essentially no Defense).
This is weird, I have tested the file in .ods and .xls formats and can not replicate this error.
The only way I have found to get #N/A in the SU used and remaining is by:
1) Entering a hull of less than 2 or more than 12.
2) Entering a Defense factor of 1.
I do think that it might have been mentioned on page 29 that the plus 1 would only apply if the ship had shields of some sort.
What spreadsheet type are you using? Does the N/A show anywhere else?
Anyone else had this problem? It is straight addition and subtraction, nothing fancy.