▁safety ▁built ▁into ▁their ▁recommend ations . ▁D ivers ▁can ▁and ▁do ▁suffer ▁decom pression ▁sick ness ▁while ▁remaining ▁inside ▁N DL s , ▁though ▁the ▁inc idence ▁is ▁very ▁low . ▁Each ▁N DL ▁for ▁a ▁range ▁of ▁depth s ▁is ▁printed ▁on ▁d ive ▁tables ▁in ▁a ▁grid ▁that ▁can ▁be ▁used ▁to ▁plan ▁div es . ▁There ▁are ▁many ▁different ▁tables ▁available ▁as ▁well ▁as ▁software ▁programs ▁and ▁calcul ators , ▁which ▁will ▁calculate ▁no ▁decom pression ▁limits . ▁Most ▁personal ▁decom pression ▁computers ▁( d ive ▁computers ) ▁will ▁indicate ▁a ▁remaining ▁no ▁decom pression ▁limit ▁at ▁the ▁current ▁depth ▁during ▁a ▁d ive . ▁The ▁displayed ▁interval ▁is ▁continu ously ▁re vised ▁to ▁take ▁into ▁account ▁changes ▁of ▁depth ▁as ▁well ▁as ▁el apsed ▁time . ▁ ▁Cont inu ous ▁decom pression ▁ ▁Cont inu ous ▁decom pression ▁is ▁decom pression ▁without ▁stops . ▁Instead ▁of ▁a ▁fairly ▁rapid ▁as cent ▁rate ▁to ▁the ▁first ▁stop , ▁followed ▁by ▁a ▁period ▁at ▁static ▁depth ▁during ▁the ▁stop , ▁the ▁as cent ▁is ▁slower , ▁but ▁without ▁officially ▁stopping . ▁In ▁theory ▁this ▁is ▁the ▁optim um ▁decom pression ▁profile . ▁In ▁practice ▁this ▁is ▁very ▁difficult ▁to ▁do ▁manually , ▁and ▁it ▁may ▁be ▁necessary ▁to ▁stop ▁the ▁as cent ▁occasionally ▁to ▁get ▁back ▁on ▁schedule , ▁but ▁these ▁stops ▁are ▁not ▁part ▁of ▁the ▁schedule , ▁they ▁are ▁corre ctions . ▁For ▁example , ▁US N ▁treatment ▁table ▁ 5 , ▁referring ▁to ▁treatment ▁in ▁a ▁decom