▁tables , ▁and ▁for ▁that ▁matter , ▁to ▁modify ▁them ▁to ▁suit ▁himself ▁or ▁herself . ▁ ▁De com pression ▁software ▁is ▁available ▁for ▁personal ▁computers ▁to ▁model ▁the ▁decom pression ▁requirements ▁of ▁user ▁specified ▁d ive ▁profiles ▁with ▁different ▁gas ▁mi xt ures ▁using ▁a ▁choice ▁of ▁decom pression ▁algorithms . ▁Sch ed ules ▁generated ▁by ▁decom pression ▁software ▁represent ▁a ▁diver ' s ▁specific ▁d ive ▁plan ▁and ▁breath ing ▁gas ▁mi xt ures . ▁It ▁is ▁usual ▁to ▁generate ▁a ▁schedule ▁for ▁the ▁planned ▁profile ▁and ▁for ▁the ▁most ▁likely ▁cont ing ency ▁profiles . ▁ ▁A ▁personal ▁d ive ▁computer ▁is ▁a ▁small ▁computer ▁designed ▁to ▁be ▁worn ▁by ▁a ▁diver ▁during ▁a ▁d ive , ▁with ▁a ▁pressure ▁sensor ▁and ▁an ▁electronic ▁timer ▁mounted ▁in ▁a ▁water proof ▁and ▁pressure ▁resist ant ▁housing ▁which ▁has ▁been ▁program med ▁to ▁model ▁the ▁in ert ▁gas ▁loading ▁of ▁the ▁diver ' s ▁t issues ▁in ▁real ▁time ▁during ▁a ▁d ive . ▁A ▁display ▁allows ▁the ▁diver ▁to ▁see ▁critical ▁data ▁during ▁the ▁d ive , ▁including ▁the ▁maximum ▁and ▁current ▁depth , ▁duration ▁of ▁the ▁d ive , ▁and ▁decom pression ▁data ▁including ▁the ▁remaining ▁no ▁decom pression ▁limit ▁calculated ▁in ▁real ▁time ▁for ▁the ▁diver ▁throughout ▁the ▁d ive . ▁The ▁d ive ▁computer ▁keeps ▁track ▁of ▁resid ual ▁gas ▁loading ▁for ▁each ▁t issue ▁used ▁in ▁the ▁algorithm . ▁D ive ▁computers ▁also ▁provide ▁a ▁measure ▁of ▁safety ▁for ▁divers ▁who ▁accident ally ▁d ive ▁a ▁different