Flat earthers may claim that you can bring an entire ship that has passed over the horizon, completely out of view, to completely back into view in its entirety by viewing it with a telescope.
When I was in the U.S. Navy, unfortunately we had none of those telescopes the flat earthers used. Once a ship passed over the horizon, the last thing that we could see were the tops of the masts of those ships. And we could not bring all of those ships back into view with our telescopes after they had passed over the horizon and out of sight completely.
We could only magnify with our telescopes.
We couldn't even bring land back into view after it had disappeared from view after sailing out of a port to sea.
Maybe some of the other navies in the world had better telescopes than ours and could do what the flat earthers claim they can do.
If a ship sails so far that it appeared to be so small that it appeared to disappear, you could restore it back to view with a telescope....before it had passed over the horizon. But once a ship had passed over the horizon, there was no way you could see it again, even with the most powerful telescope. Even for a lookout in the crow's nest, 100 feet high, the horizon would be no more than 12 miles away.