I test my ships in FMB 3D view how far we can see...
about 11000m or 12000m, ships become invisible, instead of LOD meters is bigger like 15000m.
Something the limitation of IL-2 1946 graphic engine - fr visibility - exist, I think.
I can't realize The exact value of that limit distance.
I feel about 11000m or 12000m.
IL-2 1946 can treat bigger value like 18000 without any error or warning in game/FMB,
we can set LOD distance we like, but that value doesn't match game visibility.