Thanks Meggs - I will sort out the manual!
We might be able to sneak it back in in a while - to be honest it was one of the things that was dropped as we pushed to get 1.6 out, and I figured the functionality could be provided in other ways.
If you do want to keep your contours, you can use the transparent palette in the map project, which will get rid of depth colours but keep the contours showing on top of a background image. Or else, as you say, move the image to the foreground whilst you do your waypointing.
cheers,
Matt