Thats brilliant thanks!
So I assume in that case the speed of my vessel has no affect on the speed that those bearing lines move away from each other.
I can now believe the Amethyste to be at about 8nm, which in my mind makes sense as a submarine moving a 4kts might be a bit too tricky to detect at 12nm?
That has helped me out bigtime, I spent nearly an hour head scratching and could'nt decide!
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