THE QUADRANGLE: 3-view WIP

[Maker of the Way]

This is my latest, The Quadrangle. a 3-in-1 map showing the northern portion of Graybeard Island where the treasure burial site is located.
It includes an overview of the northern island, a large depiction of the burial area with the "sighting stones", and a smaller cross-section view of what is under the "X". Persons trying to find the treasure would need 3 in their party to get an accurate location of the "X" (with 2 lining up the sighting stones visually, and a third to walk out into the field until he crosses the other viewers line of sight.
As usual, this is being done with graphite, ink, and oil pencil on grocery bag.
It is about 2/3 done here.