The following script was developed for providing quick calculations over NITROX diving. It provides an interactive menu for the following calculations:
1 – Maximum Operational Depth (MOD)
2 – Operational Depth (OD)
3 – Best mix
4 – Equivelant Air Depth (EAD)
5 – Nitrogen percentage compared to Air
6 – Oxygen partial pressure (PO2)
7 – Central Nervous Systems Toxicity (CNS)
8 – Absolute pressure
############################################################################
# Copyright (C) 2011 Panagiotis Kritikakos <panoskrt@gmail.com> #
# #
# This program is free software: you can redistribute it and/or modify #
# it under the terms of the GNU General Public License as published by #
# the Free Software Foundation, either version 3 of the License, or #
# (at your option) any later version. #
# #
# This program is distributed in the hope that it will be useful, #
# but WITHOUT ANY WARRANTY; without even the implied warranty of #
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the #
# GNU General Public License for more details. #
# #
# You should have received a copy of the GNU General Public License #
# along with this program. If not, see <http://www.gnu.org/licenses/>. #
############################################################################
#!/bin/bash
disclaimer()
{
echo "
=======================================================
Every individual diver is responsible for planning
and conducting dives using SCUBA equipment up to the
trained and certified qualification he or she holds.
The creator of this program does not have any
responsibility for symptoms of Decompressions Sickness
when the suggested values of this program are used
for conducting a dive.
========================================================
"
}
mod(){
echo -n "NITROX mix: "; read mix
MOD=`echo "scale=2; (((1.6/$mix)*10)*100)-10" | bc`
echo " MOD for $mix NITROX: $MOD"
}
od(){
echo -n "NITROX mix: "; read mix
OD=`echo "scale=3; (((1.4/$mix)*10)*100)-10" | bc`
echo " OD for $mix NITROX: $OD"
}
bestmix(){
echo -n " Depth: "; read depth
BESTMIX4=`echo "scale=2; 1.4/(($depth/10)+1)" | bc`
BESTMIX6=`echo "scale=2; 1.6/(($depth/10)+1)" | bc`
echo " Best mix for 1.4 PO2: $BESTMIX4"
echo " Best mix for 1.6 PO2: $BESTMIX6"
}
ead(){
echo -n " Depth: "; read depth
echo -n " NITROX: "; read nitrox
EAD=`echo "scale=2; ((((1-($nitrox/100))*4)/0.79)-1)*10" | bc`
echo " EAD for $depth MSW and NITROX $nitrox: $EAD"
}
compare(){
echo -n " NITROX: "; read nitrox
EQU=`echo "scale=2; 100-(((1-($nitrox/100))/0.79)*100)" | bc`
echo " ${EQU}% less nitrogen"
}
po2(){
echo -n " Depth: "; read depth
echo -n " NITROX: "; read nitrox
PO2=`echo "scale=2; (($depth+10)/10)*($nitrox/100)" | bc`
echo " PO2 at $depth MSW for NITROX $nitrox: $PO2 ATM"
}
cns(){
echo -n " PO2 [1.4, 1.5, 1.6]: "; read po2
echo -n " Duration: "; read duration
if [ "$po2" == "1.4" ]; then
CNS=`echo "scale=2; ($duration/150)*100" | bc`
elif [ "$po2" == "1.5" ]; then
CNS=`echo "scale=2; ($duration/120)*100" | bc`
elif [ "$po2" == "1.6" ]; then
CNS=`echo "scale=2; ($duration/45)*100" | bc`
else
echo " Choose between 1.4, 1.5 and 1.6 PO2"
exit 1
fi
echo " CNS for $duration minutes and $po2 PO2: ${CNS}%"
}
absolute(){
echo -n " Depth: "; read depth
ABS=`echo "scale=2; (($depth/10)+1)" | bc`
echo " Absolute pressure at depth of $depth MSW: $ABS ATM"
}
echo " 1 - Maximum Operational Depth (MOD)"
echo " 2 - Operational Depth (OD)"
echo " 3 - Best mix"
echo " 4 - Equivelant Air Depth (EAD)"
echo " 5 - Nitrogen percentage compared to Air"
echo " 6 - Oxygen partial pressure (PO2)"
echo " 7 - Central Nervous Systems Toxicity (CNS)"
echo " 8 - Absolute pressure"
echo
echo -n " Function: "; read option
disclaimer
case "$option" in
1)
mod
;;
2)
od
;;
3)
bestmix
;;
4)
ead
;;
5)
compare
;;
6)
po2
;;
7)
cns
;;
8)
absolute
;;
*)
echo " Please choose a valid option from the menu"
exit 1
esac
: | : vortex of false deceit : | : 