Re: Can I get rid of this Thick Black Line in Vector charts?
Happy..
That is the "Safety" contour, or the shallowest contour which is greater than or equal to your declared SafetyDraft.
It's a safety feature, part of S52 Display standards. Inside this contour, there is at least one point where the depth is known to be less than your Safety Depth.
If you don't need this visual hint, you may increase your Safety Depth to a very big number.