DUDE . SLAP YOUR INSTRUCTOR !! he should have told you this !
shallow or not, you need to know this as a diver !
BETTER YET, tell us who he is so that we do not send good people his way !
for crying out loud, you need to know how DEEP you have been and how long you need to de-compress, this is why D B is here !
screw a computer, THINK FOR YOUR SELF !!! USE THE DIVE TABLES !!!