BombsGone - thanks for the link. It's interesting that that old AIC has reappeared in a different form online. As said, it contradicts the CARs and CAOs.... No doubt two FOIs will have three opinions on the matter
I guess the key here seems to be "without external reference". Not that you're not looking at them but that they don't exist.
Exactly. And there are not too many areas and even fewer occasions when this is the case. e.g. you'd struggle to meet this in Victoria when clear of cloud.