After a good amount of time playing with very experienced Conclavers, we decided to create a callout system based on a very rudimentary one already in place (Sun Spawn, Moon Spawn, Tower, Twin Towers, Mid). We've been using this system for some time now, and is even used throughout my clan. Recently, to assist in clarity, I created a stitched-together map of the various callouts including a second map that covers the top areas if needed. I've decided to make this public, mostly because I think they're harmless.
Note: "Twin Towers" is labeled as such solely because of the single "Tower" directly opposite from them. It's not intended to cause any offense.