Of course, at night in less than crystal clear conditions, how much useful visibility is there really? 100 yards might be pushing it, especially in remote areas where there is no loom or light pollution from brightly lit urban areas.
Also, in low light, it can be much more difficult to determine what the sea state is.
I'd also point out that in coral strewn areas like the Bahamas, making an entrance when you can't see the coral heads is not the brightest move in the world. Coral heads don't always appear on the chart plotters, and they're basically invisible at night. It only takes a single coral head in the wrong place to ruin your approach and take your life.
"How do you predict"....didn't say you could. That's why someone might be tempted to have a look-see.
"easy to be off by 100 yds".....if I were to attempt something this foolish, I'd have the radar on to keep me in the middle, and, of course, the depth sounder going to avoid the really thin water.....
but all that doesn't do you any good when you get hammered by a really big wave.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.