I have been looking at the Astral Plane map and I can pick up some interesting things on both the horizontal and vertical view.
First off the Wind rose on the bottom right of the horizontal picture confirms the use of cardinal directions which is repeated on 4 side of the globe. Two fragments are repeated and not linked to a special imagery(as far as I know) and just floating here and there.
For the vertical picture we can deduce the top and bottom fragments of the globe are North and South respectively. I also do not recognize the symbol which stands for the R since it's very tiny. The Sun is well that is very much a sun and the moon next to it leaves little room for confusion. Unsure if it happened before but we have instances of two symbols for one letter(soUth and sUn, North and suN). This means there may be doubles for the entire roman alphabet.
Last but not least I am very unsure about the W _ N _ on the left: it could be Wind bt the drawing around it is ambiguous, could be wane as in the verb?