I think most people are okay to be on their own once they have an Advanced level certification even if they do Basic and Advanced back to back. I voted 100 dives because that was the least number I think. To truly be competent, 100 dives in diverse conditions is probably about right. But to plan and execute safely simple dives in benign conditions that most of us dive in, far, far fewer. SCUBA diving is not a dangerous sport, well, unless you let it be so. Rather than competency, the biggest detriment to safe diving that I see is overweight and out of shape and physically unfit divers. N