I still see many people doing complicated things to make a plot in the game's map, so I decided to create a little graphic add-on (Essentially compatible with all mods around) that makes plotting in SH4 using my personal system and the game's tools a joyful experience.
Like to the file with tutorial on how to use it:
http://files.filefront.com/SH4+Plott.../fileinfo.html
In-game example of a plot (Described in detail step-by-step in the tutorial), click on it for bigger image:
WARNING: It works well in my 1400x1050 monitor and apparently also in all 4:3 sapect ratio resolutions, but I can't guarantee 100% it will in all other cases. You will need to test for yourself.
Happy hunting