This webpage will present suggested changes to be included in Rev 7. These have not been formally accepted and they are shared for your information and feedback. Changes are implemented in the draft Rev 7 which you may download from the righthand panel. Information in paranthesis list date and Revision serial of the change.
If you want to trace changes in earlier versions then visit this webpage.
Minor printing error corrected on page 15 serial 4 (referring to incorrect table). (Rev D, 21.1.2026)
Corrected error in the table (Rev A, 12.12.2024)
Stated that nitro dives without planned staged decompression ("No-decompression dives") may be continued for multiple days without requirement for days off diving if oxygen fraction is 40% or less (Rev C, 20.12.2025)
Clarified that EAD tables for non-standardized Nitrox mixes can be downloaded from this website. Stated that Nitrox mix tolerance is +/- 1.0% rather than 0.5% in compliance with EN-12021 standard for breathing gases. (Rev B 23.9.25)
Experience from an offshore diving operation 2024 disclosed significant differences in measured oxygen fraction (FO2) of nitrox gases dependent on measurement site (gas manufacturer, contractor reception, mobilization, operation, demobilization) and instrument used for gas analysis. The reason(s) for this is/are not fully understood, but there is a suggestion to either decrease allowed bottom time by one step or decompress according to one table depth deeper to accomodate such fluctuations. Detaails of this proposal can be found in this document. The editors have per december 2025 not concluded on this question.
Error in example in serial 22 corrected (Rev E, 24.1.2026)
You may review the progress in the revision process of Ed 7 by downloading the draft version 7 below. This version is not approved for operational use!