Uuummmmm....stress cracks don't necessarily mean bad ice. Actually, it is just the opposite.
Dark ice like that is sorta safeish when only an inch thick. That stress crack is caused by the face that the ice is so dense, as it freezes it doesn't compress. Stress cracks are comforting.
Quite often, the shore is fine, and maybe safer than in the middle. Near shore the ice freezes almost all the way through to the bed....its solid ice, almost no water there. I suppose it all depend though, cuz our lakes always freeze when the water is smooth as glass....
EDIT: Oops, couple got in before me