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Some dive computers also calculate air mixtures for deeper dives that require Nitrox, or oxygen-enriched nitrogen. These dive computers have the vital job of measuring and tracking your nitrogen intake for you to plan your bottom time. They do this by basing calculations on a diver's depth and time spent submerged. Most of these also display your current depth and maximum depth, along with your dive time. Optional features include a pressure gauge, remaining air monitor, and a display that shows how much breathing time is available based on the amount of air in the tank and the diver's breathing pattern. The Oceanic computer watch can monitor Nitrox air mixtures below surface and function as a regular watch on land.