 As a result, the diver can make a slower ascent than would be called for by a decompression schedule computed by the identical algorithm, as may suit the circumstances, and will be credited for gas elimination during the slower ascent, and penalized if necessary for additional ingassing for those tissues affected.This provides the diver with an unprecedented flexibility of dive profile while remaining within the safety envelope of the algorithm in use.Ratio decompression (usually referred to in abbreviated form as ratio deco) is a technique for calculating decompression schedules for scuba divers engaged in deep diving without using dive tables, decompression software or a dive computer.