ty for the infos even if I knew most of those, now I try to answer your questions:
1)"or do you have a picture that combines several game maps?"
my world map is a simplified vision of all maps of the games, it's not a straight grid, but a more accurate indicator of a positioning, example:
the player is in the village, the cursor show the village indication;
the player now leave the village in a forest trail, long several maps, then the indicator show some point in the world map that lead to next location Example metallic crater, those coordinate are generated by me accordingly of my story and interpretation, so those aren't straight lined.
2)" how big is the map in tiles and how big is the map picture in pixels?"
as I said the coordinates are unique id and must match resolution set by me, not all( the game is for pc and android, I must create at least 2 resolutions)
i knew the mathematics works, i'm used to that, I love math works, but the problem that I have is to understand a way to have the interpreter(rpg maker) recognize my coordinate even if I change resolution, cause as I said if I switch resolution to "android" those will mismatch.
So as you said at the end I mostly need script supporting, someone know how to reach that?
I could find a solution alone but I'm here asking for tips cause I'm doing a commercial game and I am the scripter, the eventer, the graphic guy and the music guy, but fortunately I'm not a crap artist

I hope someone could lead me into this kind of dynamic coordinates and save my time, soon I will post updates to my game so you can see the work, working ^_^
Thanks btw Andar for your support, I appreciate your interest and some of your tips were useful for my focus.
Expecially last one, where you say that is bad using move picture for coordinate pointer, there are other reason aside the resolution mismatch?