The problem with the 8km visibility is that it puts up a wall of fog 8 km (5 miles) away. Anything outside of that cannot be seen, and when it crosses that line it becomes instantly visible. This is true of the longer-range mods as well, but at the longer distances it isn't as apparent.
Here's what influenced me: Do I really find it realistic to not be able to see a lighthouse from 5.1 miles away? No, I don't. From a height of 2 meters the horizon is approximately 7 km away. That's the horizon. A ship with a bridge height of 10 meters is going to be visible at 13 km, and the masts at twice that, if you can pick them out at all.
So for me 20 km is perfectly realistic.
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