There is a first time for anything, and today I left the area of a control site (11) with out finding the control.
Turns out I was on a track under the circle. I went in twice, even had a walk through the bush as the 'dot' wasn't on the track, but still no control. As I left, I stopped at the next (right) track, didn't see the control, convinced myself I was a track further north, so wandered on.
Gave up a little after that, as I was in 2 minds about my end result