I also follow the basic policy that K-61 spoke of.
In addition, I was a tad short to the OP earlier - was rushed. But think about it - normally in any kind of fog there is no wind - or the fog would very shortly be cleared off. In that situation, the flag even if flown is limp and just hanging down - VERY hard to see and ID. Ditto in any strong wind - either they take it down, or it is whipping so hard it again is hard to see, and in addition has a very good chance to be in tatters soon.
Under prize rules, a darkened ship was presumed to be non-neutral as she is obviously trying to be sneaky - a true neutral will be brilliantly lit up with the flag especially lit up whenever she is anywhere near known hostile waters. Act accordingly.
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