23,000 hrs and no emergency descents so don't dwell on it much but once in a lifetime if it happened I wouldn't wait, just turn right off track and get down with no delay. With GPS nav you are now going away from opposite and same direction traffic with little chance of conflict. Keep it simple, just turn and dive. I know, somebody might be using offtrack 1 mile nav but usually you can see out the window while you are doing this, if not you gave it your best shot and it is not your day.