Support for my hypothesis that the map was wrong at 7 - I ran up that index contour re-entrant and up the hill (unmapped) slightly to the right and the depression control was to the right of that. I don't know what happened at 4, I suspect it was gps madness - but I wasn't expecting to come out so close to that water control (where the gps is accurate).
Where the control was at 9, up at the very top of the re-entrant, was not all that far from the west end of the hilltop.
Afaik, I was running (jogging/walking) south until I punched 11, so gps is off there.
Fun times, even if I wasn't orienteering wonderfully this weekend.