I am actually not questioning Lambchops observation
I am trying to understand it
Are we talking about light on shore, getting into the water or ten to fifteen feet out?
I was responding to a discussion about how much water GG and RG could see or be seen from whether they were swimming.
The answer is they couldn't see much while swimming; their eyes would be too close to sea level. The boat full of mythical white slavers would have had better visibility because of the boat's height, but picking an individual swimmer out of many square miles of empty ocean can't be an easy task.