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HI,
I have been searching for a while but cant find the exact answer I need.

I am designing the layout to a new dashboard in my bus. I want to use Gimp to draw the dashboard, then the guages on different layers, and place them in different positions to get the best layout. I know how to use all the tools. 

What I don't know is how to set the scale, I guess, of the canvas so that I get an accurate representation of the real world size. 

the dash is 215mm by 555mm when I use the rectangle tool and set the measurements to that, using the default drawing size, it goes off screen. 

How do I set up the scale or resolution etc, so that I can draw the correct size and it all appears inside the canvas area? 

I am not printing the drawing, I just need a visual representation so I can transfer positions and spacing onto the actual dashboard prior to cutting out. 

Cheers.