pression ▁computer ▁to ▁provide ▁an ▁accurate ▁record ▁of ▁the ▁actual ▁d ive ▁profile , ▁and ▁the ▁computer ▁output ▁may ▁be ▁taken ▁into ▁account ▁when ▁dec iding ▁on ▁the ▁as cent ▁profile . ▁The ▁d ive ▁profile ▁recorded ▁by ▁a ▁d ive ▁computer ▁would ▁be ▁valuable ▁evidence ▁in ▁the ▁event ▁of ▁an ▁accident ▁investigation . ▁ ▁Sc uba ▁divers ▁can ▁monitor ▁decom pression ▁status ▁by ▁using ▁maximum ▁depth ▁and ▁el apsed ▁time ▁in ▁the ▁same ▁way , ▁and ▁can ▁use ▁those ▁to ▁either ▁select ▁from ▁a ▁previously ▁compiled ▁set ▁of ▁sur f acing ▁sched ules , ▁or ▁identify ▁the ▁recommended ▁profile ▁from ▁a ▁water proof ▁d ive ▁table ▁taken ▁along ▁on ▁the ▁d ive . ▁It ▁is ▁possible ▁to ▁calculate ▁a ▁decom pression ▁schedule ▁for ▁a ▁mult ile vel ▁d ive ▁using ▁this ▁system , ▁but ▁the ▁possibility ▁of ▁error ▁is ▁significant ▁due ▁to ▁the ▁skill ▁and ▁attention ▁required , ▁and ▁the ▁table ▁format , ▁which ▁can ▁be ▁mis read ▁under ▁task ▁loading ▁or ▁in ▁poor ▁visibility . ▁The ▁current ▁tr end ▁is ▁towards ▁the ▁use ▁of ▁d ive ▁computers ▁to ▁calculate ▁the ▁decom pression ▁oblig ation ▁in ▁real ▁time , ▁using ▁depth ▁and ▁time ▁data ▁automatically ▁input ▁into ▁the ▁processing ▁unit , ▁and ▁continu ously ▁displayed ▁on ▁the ▁output ▁screen . ▁D ive ▁computers ▁have ▁become ▁quite ▁reliable , ▁but ▁can ▁fail ▁in ▁service ▁for ▁a ▁variety ▁of ▁reasons , ▁and ▁it ▁is ▁pr udent ▁to ▁have ▁a ▁backup ▁system ▁available ▁to ▁estimate ▁a ▁reasonable ▁safe ▁as cent ▁if ▁the ▁computer ▁fails .