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Not an overlay, but side by side views are shown, when scrolling down enough, in the French article linked by @thinkingremote : https://www.inrap.fr/la-plus-ancienne-carte-d-europe-15574#

Maybe two maps side by side, relating waypoints to actual points?

Overlaying probably wouldn’t help. These maps are not scaled. They represent landmarks, so it’s more a waypoint navigation list than what we think of as a geographic map.

It would have still been nice to have some kind of visual representation. There must be a visual way to link the map to reality -- the map is a visual device, after all.

They even have this line:

> Geo-location revealed the territory represented on the slab bears an 80% accuracy to an area around a 18 mile-long stretch of the river.

Which 18 mile-long section? That alone could have been provided.

Obviously you overlay points, and not the whole map.

This way you can see how the slab references real life points, which you can show on a correctly scaled map.