Spot the Problem …

I was just grazing some of OML's online images, and for some reason decided to look at a map of Palestine, based on the original work ofTilemann Stella, from a later edition of Ortelius's Theatrum orbis terrarum (OML-1597-7). Among other things, it shows the supposed route of the Israelites during the Exodus. But then I noticed, on the left-hand side,

Detail from 1597 Palestine - Orteius OML-1597-7

Wow - that's some magnetic variation! (FYI, S stands for septentrionalis (North), OR for oriens (East), M for meridiones (South), and OC for occidens (West)).