▁profile ▁to ▁that ▁originally ▁planned . ▁Most ▁d ive ▁computers ▁will ▁provide ▁the ▁necessary ▁decom pression ▁information ▁for ▁accept ably ▁safe ▁as cent ▁in ▁the ▁event ▁that ▁the ▁no - de com pression ▁limits ▁are ▁exceed ed . ▁The ▁use ▁of ▁computers ▁to ▁manage ▁recre ational ▁d ive ▁decom pression ▁is ▁becoming ▁the ▁standard ▁and ▁their ▁use ▁is ▁also ▁common ▁in ▁occup ational ▁scientific ▁div ing . ▁Their ▁value ▁in ▁surface ▁supplied ▁commercial ▁div ing ▁is ▁more ▁restricted , ▁but ▁they ▁can ▁use fully ▁serve ▁as ▁a ▁d ive ▁profile ▁rec order . ▁ ▁Cont rolling ▁depth ▁and ▁as cent ▁rate ▁▁ ▁A ▁critical ▁aspect ▁of ▁successful ▁decom pression ▁is ▁that ▁the ▁depth ▁and ▁as cent ▁rate ▁of ▁the ▁diver ▁must ▁be ▁monitor ed ▁and ▁sufficiently ▁accur ately ▁controlled . ▁Pract ical ▁in - water ▁decom pression ▁requires ▁a ▁reasonable ▁toler ance ▁for ▁variation ▁in ▁depth ▁and ▁rate ▁of ▁as cent , ▁but ▁unless ▁the ▁decom pression ▁is ▁being ▁monitor ed ▁in ▁real ▁time ▁by ▁a ▁decom pression ▁computer , ▁any ▁devi ations ▁from ▁the ▁nom inal ▁profile ▁will ▁affect ▁the ▁risk . ▁Several ▁items ▁of ▁equipment ▁are ▁used ▁to ▁assist ▁in ▁facil it ating ▁accurate ▁ad her ence ▁to ▁the ▁planned ▁profile , ▁by ▁allowing ▁the ▁diver ▁to ▁more ▁easily ▁control ▁depth ▁and ▁as cent ▁rate , ▁or ▁to ▁transfer ▁this ▁control ▁to ▁special ist ▁personnel ▁at ▁the ▁surface . ▁ ▁A ▁shot ▁line ▁is ▁a ▁ro pe ▁between ▁a ▁float ▁at ▁the ▁surface , ▁and ▁a ▁sufficiently ▁heavy ▁weight ▁holding ▁the