You can see the outline of continents take shape from just charting 19th century ship patterns. There are voids in the map, of course, but it’s impressively clear in so many parts too.

This was sent in by D. Whitaker, this area here. And he noticed this iceberg here, if we go to the 3D format, you look down on it. It looks like the outline of a ship, and this one here measures ...