I agree with IO540 on this - as I said in my earlier post the simplest and most foolproof way of stopping zone infringements is by training pilots to use and equipping aircraft with moving map GPSs.
I know some will go on putting forward the age old arguments about reliability but there seems so little evidence to support these arguments. In fact there never really seems to be any evidence at all.
Consider the facts. In my experience I have never lost the GPS signal (not a single time) and I have never found my position to be any where other than that shown on the moving map. I have also never had the GPS unit fail (although I fly with two and have a third in my bag!). In the same time the VOR has failed twice and the DME once. Moreover the moving map tells you exactly what you should expect to see on the ground. Personally I would expect you to compare the ground information with the map occasionally - it really is not that hard - and there is no better fail safe.
There is a whole debate about skirting very close to CAS. However you see that debate, it cannot but help to tell the controller that you intend to skirt his CAS closely. In so doing he does know you know where you are and if he thinks you are beginning to invade his territory is likely to tell you before it becomes a problem. Whilst I don’t know the precise circumstances of the King Air bust once again had the controller known their intention to skirt CAS closely I would expect they might have warned of the infringement.
We should not forget CAS is like a prison wall keeping not only us out (without permission) but also the rest in. Whilst it is not the controllers implicit responsibility to keep us they don’t want the hassle of zone infringements any more than we (on the whole).