Scuba divers using Nitrox (enriched air) will find this to be a great planning tool for diving.
"Nitrox Diver" uses the two standard
32% Oxygen (68% Nitrogen)
36% Oxygen (64% Nitrogen)
tables for calculations and is in both imperial and metric systems.
Some deco times are provided for those dives that show it on the tables.
This is a tool is to be used as a reference only. You should always refer to your training and the materials provided by your certifying agency.
Your certifying agency will also no doubt have told you that even strict compliance with the dive tables will not guarantee avoidance of decompression sickness. Conservative usage is strongly recommended.