PS: And yes, could very well be that those JSGME complaints (plus the missing boats in-game) actually stemmed from something else altogether, because they went away after disabling some _other_ mods and re-loading some of them in a different order. So this is what I've got loaded now:
(...assorted GWX option mods...)
RealWeatherFixMod
depth charge noise distruption_alpha
GWX - Black Sea Campaign Files Only
JSGME also complains of a file conflict between DCN and Increased ASW, BTW, but this I presume is something you're aware of
S!