▁expected ▁to ▁do ▁decom pression ▁div es ▁in ▁the ▁normal ▁course ▁of ▁their ▁sport ▁or ▁occupation , ▁and ▁are ▁specifically ▁trained ▁in ▁appropriate ▁procedures ▁and ▁equipment ▁relevant ▁to ▁their ▁level ▁of ▁cert ification . ▁A ▁significant ▁part ▁of ▁practical ▁and ▁theoretical ▁training ▁for ▁these ▁divers ▁is ▁on ▁the ▁practice ▁of ▁safe ▁and ▁effective ▁decom pression ▁procedures ▁and ▁the ▁selection ▁and ▁use ▁of ▁the ▁appropriate ▁equipment . ▁ ▁See ▁also ▁ ▁References ▁ ▁S ources ▁ ▁Further ▁reading ▁▁▁▁▁ ▁Section   2 ▁chap ters   1 3 – 2 4 ▁pages   1 8 1 – 3 5 0 ▁ ▁External ▁links ▁▁ ▁D ive ▁tables ▁from ▁the ▁NO AA ▁ ▁German ▁B GV ▁C ▁ 2 3 ▁table , ▁perm itting ▁a ▁simplified ▁procedure ▁of ▁decom pression ▁planning ▁ ▁Online ▁d ive ▁table ▁calcul ator ▁ ▁* ▁Category : De com pression ▁equipment <0x0A> </s> ▁In ▁the ▁fields ▁of ▁card i ology ▁and ▁medical ▁imag ing , ▁spe ck le ▁tracking ▁e ch oc ardi ography ▁( ST E ) ▁is ▁an ▁e ch oc ardi ographic ▁imag ing ▁technique ▁that ▁analy zes ▁the ▁motion ▁of ▁t issues ▁in ▁the ▁heart ▁by ▁using ▁the ▁naturally ▁occurr ing ▁spe ck le ▁pattern ▁in ▁the ▁my oc ard ium ▁or ▁blood ▁when ▁im aged ▁by ▁ul tras ound . ▁This ▁novel ▁method ▁of ▁documentation ▁of ▁my oc ard ial ▁motion ▁represents ▁a ▁non in vas ive ▁method ▁of ▁definition ▁of ▁vectors ▁and ▁velocity . ▁When ▁compared ▁to ▁other ▁techn ologies ▁seeking ▁non in vas ive