This is not exactly a difficult thing to do. Create a texture that sits at (screen width / 2, screen height / 2). That's where you are. If you don't know Lua, just get kgPanels and put a panel in the middle of your screen. Although I'm really not sure why you need to know where you are. If it's to position yourself correctly just point the camera straight down, that's more accurate than a UI blob would be anyway.
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