This is an interactive calculator for the No Decompression Limits table and the Residual Nitrogen Times table. A diver can enter his initial dive depth and bottom time and get the Repetitive Group Designator (RGD) and table/schedule values. The diver can then enter information about repetitive dives and get the new RGD, residual nitrogen time, equivalent single dive time, table/schedule values and repetitive RGD.