 The dive computer has the advantages of monitoring the actual dive, as opposed to the planned dive, and does not assume on a "square profile" – it dynamically calculates the real profile of pressure exposure in real time, and keeps track of residual gas loading for each tissue used in the algorithm.Dive computers also provide a measure of safety for divers who accidentally dive a different profile to that originally planned.If the diver exceeds a no-decompression limit, decompression additional to the ascent rate will be necessary.