Moving 2 objects coorespondingly with different scaling.

Hi, I have a terrain which is 1000(L) x 1000(W). I also created a cube, 500(L) x 500(W) and pasted a screen shot of the terrain onto it.

I’m trying to code out the script which allows an indicator on the cube( w screen shot of terrain) to move coorespondingly to the player when the player moves on the actual terrain. But the cube is scaled down by half, and the distance travelled will be different. How can i start about doing it? Help would be appreciated. Thanks! (:

Anyone? I really need help. ): Please.