The WAC charts for Australia.... Is it 1 seamless digital version for Australia, or are the individual WACs scanned and 'stuck' together to form a near seamless WAC? (I would assume a digital version can automatically account for the mapping projection used)
What we get are digital files of the individual maps, but they are just images with geo-referencing information. So we need to stitch them together and in the process they also get warped to the correct projection. So yes, some quality is lost in that process, as always happen when you transform an image.