I had a lockout recently when the battery was depleted completely on a long dive. So I was disappointed to find out that the Eon was useless for the next 48h, considering the dive was shallow without deco time.The ONLY way an Eon will lock you out is if you ignore your deco ceiling by 3 mins. Either you have a serious issue and need to be on the surface (thus not going to be diving for 48hrs) Or you're an idiot and deserve the lock out