Willem, could you please have a look at the final computation in static double calculate_cns_dive(const struct dive *dive) in divelist.c
It seems to me that the first minus in
cns += (double)t / ((double)cns_table[j][SINGLE_EXP] -
((double)po2i - (double)cns_table[j][PO2VAL]) *
(double)cns_table[j][SINGLE_SLOPE] / 10.0) * 100;
should be plus (at least according to the formula in the comment above. At
least, with this minus, you get negative CNS values for a planned air dive to
80m of depth.
Best
Robert
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