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.
