In VTS, the screen is laid out in an x-y grid with the x-axis horizontal and the y-axis vertical. When VTS is first started, the upper left corner of the screen is the origin (where both x and y are 0). X represents the number of pixels (dots) from the left side of the window. Similarly, y represents the number of pixels (dots) from the top side of the window.
Note that there is both a function that can provide the current display resolution (VStatus), and a statement, which can change the world coordinate limits (Coordinates).
Additionally, the VTS Coordinates utility enables you to precisely determine the horizontal and vertical coordinates of the mouse pointer within any VTS window (page or dialog). For further information on the Coordinates utility, please refer to Coordinates Application.