Ken,
I didn't mean low vis, I was talking about seeing through 40 000' of North Sea smeg. (smeg, in Scotland, isn't a brand of domestic appliance)
CM,
I'd imagine, that on the two days a year that you get a clear night in Scotland, the N Sea rigs will make the thingy go nuts! There is a finite point where detection range and false target rejection cross over. I hope those boundaries are adjustable depending on the theatre of Ops.
I imagine the HMD in Central Europe, on WW3 day one, would look like an American house at x-mas!!