Thanks for your reply James.
Ok, maybe I asked for too much here, but maybe it can be limited to 10 areas, like the position of the letters today a-j. Each position could have a symbol or a letter, so it's easy to understand what to do with the picture. Then just run your pointer over the symbols, and they change color so you know which one is active...
No calcualtions or anything! Just use the values available, and maybe add a few more.
