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Find myself wondering how those of you without VR3s and suchlike manage with calculating CNS and UPTDs (OTUs) on dives - and whether you bother. Then go on to wonder what the VR3 (or any other computer which will work this out) calculates the percentage used on a particular dive and how much variation there is in the results, and finally whether people take any notice at all. So - for those who want to play.....
To get us all on the same page herewith a dive profile which has been posted before. Hope it is legible enough.
The reason I have posted a profile rather than a set of figures is that I caluclate using bottom time whereas some might calculate from surface. Gases were 18/45, 50 per cent from 21, 18/45 at 9 and O2 from 6. The exact time from surface to leaving the bottom was 27 minutes if you calculate on this.
If you dive in this depth range do you calculate your CNS at all?
If not - would you do so on a repetative series of dives?
If you do - how?
And what would you calculate it for on this dive?
To get us all on the same page herewith a dive profile which has been posted before. Hope it is legible enough.

The reason I have posted a profile rather than a set of figures is that I caluclate using bottom time whereas some might calculate from surface. Gases were 18/45, 50 per cent from 21, 18/45 at 9 and O2 from 6. The exact time from surface to leaving the bottom was 27 minutes if you calculate on this.
If you dive in this depth range do you calculate your CNS at all?
If not - would you do so on a repetative series of dives?
If you do - how?
And what would you calculate it for on this dive?