80) “In Chambers’ Journal, February 1895, a sailor near Mauritius in the Indian Ocean reported having seen a vessel which turned out to be an incredible 200 miles away! The incident caused much heated debate in nautical circles at the time, gaining further confirmation in Aden, Yemen where another witness reported seeing a missing Bombay steamer from 200 miles away. He correctly stated the precise appearance, location and direction of the steamer all later corroborated and confirmed correct by those onboard. Such sightings are absolutely inexplicable if the Earth were actually a ball 25,000 miles around, as ships 200 miles distant would have to fall approximately 5 miles below line of sight!”

 Empty claim.

The first one relies solely on an eye-witness report of a guy who claims to have seen a certain ship from a long distance. Well... that has never turned out to be wrong in the history of human kind. Eye-witness testimony without any further evidence is scientifically worthless.

The second is almost the same thing, only that the person allegedly stated correct position, appearance and movement of the ship.

Well.. can a bare human eye resolve a ship's appearance from 200 miles away? And can you prove that the guy had absolutely no chance of knowing where the ship was from other sources? Can you prove that he wasn't just one out of thousand people who were guessing and he happened to be the one who got it kind of right? Have you heard of any guy in Yemen being able to repeat this incredible feat from that distance?

The answers are: No, no, no and... no.

http://200proofsearthisnotflat.blogspot.co.uk/2016/02/debunking-dubay-80-99200.html

Mirages can be seen by sailors, too.

Mirages can be seen by anything that can see. Don't be surprised if sailors see it.