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Comment: It depends on your height above the water. You could only see 20 miles if you were well above sea level. If â¦you are standing more or less at sea level, with your eyes just a few feet above the water level, you could see only about 3 or 4 miles. For example: Eye level at 6 feet: horizon at about 3 miles.
The ship is a further 8.7 km away. The height of a point on the ship that is just visible to the observer is given by: which comes to almost exactly six metres. The observer can therefore see that part of the ship that is more than six metres above the level of the water.