I know others have spoken [or asked] on this subject before. But it is indeed an important issue and wargames without FOW are seriously lacking, distorted even. Might this feature appear in Vassal 4 itself? The best is to allow a side owner to see his units but not those of his opponent.
Robbo
The FOW you describe does already exist in V3. Defining sides and using the Mask and Invisible traits allows for your pieces to be obscured or completely hidden from your opponent.
It is up to individual module designers to implement these, it is not a generic Vassal-level function.
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