The Sydney TAC chart is naturally skewed 20 degrees or so off so they can fit more of the major airports into a square shape.
In order to display GPS position on the maps, we have to convert them to Mercator which makes the lat/long lines run vertical & horizontal. This will rotate and slightly stretch the map however you probably won't notice the warping as it is subtle but necessary for the gps points to line up correctly on the map. Sydney TAC is obviously the most rotated map.
We're doing track-up in an update soon so you should be able to get the best of both worlds.