Bas, my understanding of WAC charts is that they are individual snapshots from the globe rather than a 'cut' map (like falconview can do) and are never meant to be stitched together. What backs this up is I had a wall of paper WAC charts. None of the charts lined up and interpretation was needed to draw accurate pencil tracks for planning.
That's correct in the printed versions. However, if you know the actual positions in the corners, you can make them square and cut them into tiles for use in an electronic mapping application.
That's what we do for OzRunways and it works very well. The only downside is cut-off labels (town names) on some stitches. Nothing that will get you lost.
Hopefully one of these decades electronic maps will become the standard and we won't have those problems. Instead, AsA will create a perfect full-country electronic WAC and it's the dinosaurs using the printed versions that will have sub-optimal cut outs!
