The Recreational Dive Planner is designed to allow divers to track the amount of nitrogen they have absorbed into their tissues while diving. This is important because when we ascend, the nitrogen comes out of our tissues and goes back into the bloodstream where it is removed when we exhale. If we absorb too much special methods are required to safely allow the nitrogen to exit our system. Dive tables are designed to keep the amount of nitrogen dissolved in our tissues at a safe level so that we can surface at anytime during the dive.