I have a bitmap image of a map that I want to "convert" into a CC3 map.

Is there a way that I can show the original bitmap map as a kind of "background" image that I can use as a guide to drawing the CC3 map.

I thought that I could import the image as a fill image, then create a new sheet especially for the guide and draw a poly on that new sheet with a fill of the image, but it appears to try and tile the image and does so badly. Is there something else I can use instead of fill to do this?