navaids/traffic maps haven't the same range than terrain map. That leads to the navaids moving on the terrain map while we fly.
there is something to check with navaids/traffic map layer to fit the range of the raster map.
The formlae to get the range isn't really clear to me, and I'm not sure about the range signification... moreover I can't remember how I got these few years ago (sadly I miss comments here)