Calculations in Metres
The equivalent air depth can be calculated for depths in metres as follows:
- EAD = (Depth + 10) × Fraction of N2 / 0.79 − 10
Working the earlier example, for a nitrox mix containing 64% nitrogen (EAN36) being used at 27 metres, the EAD is:
- EAD = (27 + 10) × 0.64 / 0.79 − 10
- EAD = 37 × 0.81 − 10
- EAD = 30 − 10
- EAD = 20 metres
So at 27 metres on this mix, the diver would calculate their decompression requirements as if on air at 20 metres.
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