I have found the current system of map polygons to be difficult to use and work with. You can only see the end result once you have created the marker and its shape can only be edited on a separate page where the map isn't visible. As someone who is writing a sci-fi setting, there are no land borders I can go by in my galaxy map to make the right shapes, resulting in having to go back and forth to get the polygons for borders of nations to land right without looking jagged.   I propose a preview of the polygon while editing, so that one can see the exact shape before creating the marker, and a preview of the polygon on the edit marker page. Simply drawing the lines out after dropping the pin would suffice.