A Dead Reckoning navigation board. Note checkered portion at the bottom.
A page of grid code showing the octopus/spider from the coded RLC tombstone of Marie d`Negri de Ables, Countess of Blanchfort.
The traverse of the DR - Dead Reckoning navigation board above (note the similarity between the
octopus tangle of ropes and the grid code on the parchment). PoS mysteries often lead back to navigation.