Another curious observation on a second look:
The map appears to note a latitudinal coordinate 53 along the left, and longitudinal coordinate 300 along the top (maybe more are visible, but I only found a short clip on YouTube). Oddly, these are close to accurate; -53, -70 would be in the vicinity of Porvenir, Chile. On the other hand, -53, -60 places the map in the Atlantic about 50 miles south of the Falklands. Oops!