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Yeah thats it, so change cf55 to 1 and its corrected, i'll do that, good to know its already been spotted and is being looked into, thanks for the help. As i said the computers excellent, really pleased with it, looking forward to giving it a try this weekend.

Yes cf 55 is indeed set to zero, strange though that 54m for 15mins is affected whereas 60m for 15min is correct, its not like gas volume used is always badly approximated its just that one depth when planning, its just coincedence that the very first deco dive ive went to plan on my new computer ...

Sorry deepest stop at top i ment, nx 80 value is at the bottom of the deco stops list

Hi, its set deepest stop at stop, which is its default value, as i say all thats not default on the custom settings is the last stop depth which is set to 6m, thanks,

Ian

Hi thanks for the replies, regards settings, i am running conservatism factor instead of gradient factors its set up in standard form of 90 and 110%, all the settings in cf are standard apart from changing last stop depth to 6m instead of 3m. The gas comsumption is spot on for loads of different ...

I have just started using my ostc 2n and im very impressed overall with the computer, however i have a question regarding gas consumption calculation in the dive planner/simulator, i can enter two gases, air bottom gas and 80% nitrox for deco and plan a dive to 54m for 15mins and the gas consumption ...