Hi Reece, that's your radar detection plating. I would imagine that these are controlled by the sensors.dat file.
When you say you are running GWX with stock u-boats, what do you mean?
If you have GWX & have just copied the relevent files from stock then you are going to get lots of problems. IIRC, Ref has changed nearly all the dat files for GWX, for reasons like Cable Fixes, Floating DG, Rotating RDF, Rotating Radar & Compass Fix aswell as more minor fixes.
I'm not sure that this will be easily fixable.
Answer me this:
Where are the U-boat DAT files from?
Where are the skin textures from & what format are they in?
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