The maker of the map was confirmed by a Supplementary Indication, which speaks of something, “inflated and his opinions hold the road”, that is, to say the famous Michelin Man. But the mega is a million times less.” This suggests the scale and the use of a much more detailed map for the ‘mega solution’ final stage. The enigma 500 mentions the scale with the line, “560,606 measurements, it is far. We know that this is the right map and scale for a few reasons.
It is often possible to find old copies of the 989 map on eBay, and they can be downloaded online see this French site for details. The number 989 is no longer available, though the new Michelin 721 is the same scale.
To set the Golden Owl puzzle Max used the Michelin 989 map published in 1993, at a scale of 1 in 1 million. Max specified that only two maps were needed for the game, with the map only really becomes necessary in enigma 500.