Thursday Survey: Ku-ring-gai Chase NP off-track explorations

On this inaugural 'Thursday Survey', we'll hopefully rediscover the way to the aboriginal carvings a few hundred metres off the Bairne Track - in country recently observed to have become overgrown and much harder to navigate.  Then we'll explore the ways to and from Refuge Bay from the Salvation Track, likewise probably not as easy as it once was. Then maybe further such explorations of the tracks and bays of the area. (And even a swim if the weather encourages it?) Warning: Thursday Surveys may contain traces of off-track adventure, flexible routing, and quite possibly some hard bits. Oh, and early starts to avoid peak hour traffic.