Originally Posted by cagney
What you describe is a feature, this is how quilting rastercharts works. There is no "background chart" as such, but CM93 is used in areas where there isn't any other coverage.
Of course this is not set in stone, and can be changed. You may want to consider a feature request in the Tracker
Thanks for pointing out that the exact location in the doc. Mind you, I didn't describe it as a bug. As least in France
, the problem is that the er ... 'available' .kap SHOM charts are way less up to date than the CM93 (they are nicer to look at though...)
There may more pressing needs though...