Calculations in Feet
The equivalent air depth can be calculated for depths in feet as follows:
- EAD = (Depth + 33) × Fraction of N2 / 0.79 − 33
Working the earlier example, for a nitrox mix containing 64% nitrogen (EAN36) being used at 90 feet, the EAD is:
- EAD = (90 + 33) × 0.64 / 0.79 − 33
- EAD = 123 × 0.81 − 33
- EAD = 100 − 33
- EAD = 67 feet
So at 90 feet on this mix, the diver would calculate their decompression requirements as if on air at 67 feet.
Read more about this topic: Equivalent Air Depth
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