You clearly missed the point. They use procedural over the ocean because they DON'T have radar coverage. Why would you use this process when you have a perfectly good radar? And the point about being 1000' apart is that if you cant SEE them then pilot error, wrong pressure setting blah blah blah can cause incidents. Take a look at the incident reports in oceanic airspace and maybe you would see the point a bit better ie pilots appearing at the wrong entry point only picked up when seen on RADAR