GPS used to direct a rover to a known destination ???HELP???

Hello guys.
I have this idea and we need it to be developed by my fellows here )
Well, I am woundering what is the logic of such project: I have a rover for example with GPS capabilities. AND I WANT THE ROVER TO HOME TO A PRE-KNOWN DESTINATION (gps location). How would the rover by knowing its current location can determine how to go to the target ????? the rover knows it is in position (X1,Y1,Z1) and it knows that the target destination is at (X2,Y2,Z2), what is the mathematical logic that the rover can use to determine its path (points on its path that can lead to the target destination)....... is there any mathematical model or logic that i can draw to understand it????? and if so does any one have suggestions to the type of microcontroller that would enable me perfom such mathematical operation????
thank you alot guys hope to see your ideas and help have a nice day

Yes, a microcontroller is similar to a small simple computer. And you can compute mathematic operation with it.

If you want to know clearly, you can download CCS C (demo) and try to do math op in C, then you view the ASM page, and you will see how it is done.