Needless to say Tooradin to Karratha is a long cross-country haul. I wonder, if it is being ferried by an American crew, whether they know there aren't too many VOR's on that route. When I was flying in the States the yanks had a preoccupation with tracking via VOR's on cross country flights, they'd almost be lost without them!
Edit: the nav is easy if you either keep the blue stuff on the left, and the brown/green stuff on the right all the way. Or vice versa. Either way you'll ultimately get to where you're going!!