Effective January 1, 2018, CHT/CHRN certification examination decompression table computation questions will be based upon the most recent version of the U.S. Navy Diving Manual. This version became effective December 1, 2016, as Revision 7.
There is no need to be concerned about this if you trained prior to the introduction of Revision 7. The computation process is identical to Revision 6 and only minor changes have been made to various time frames. As the decompression tables included with each test will be from Revision 7 there is no real impact on this updating.
Dick Clarke, President
National Board of Diving & Hyperbaric Medical Technology
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Updated December 14, 2017