In case you haven’t noticed, the U.S. Navy Diving Manual recently underwent another revision. This change took effect December 1, 2016, as Revision 7. While there are no material changes to the treatment tables and management algorithms for DCS and CAGE, some changes have occurred to the air decompression tables. For Table 9-7 “No-Decompression Limits and Repetitive Group Designators for No-Decompression Air Dives” several of the No-Stop Limits have been slightly increased (more allowable bottom time). The 25 fsw time has been almost doubled, from 595 to 1,102 minutes.
We will be advising all of the Board’s instructors that the CHT/CHRN examination questions related to air decompression procedures will be switched to Revision 7 effective July 1, 2017. Updated tables will be provided to examinees from that point. Even those who have been trained using Volume 6 should have no difficulties as the methodology to answer the questions in unchanged. Examinees will simply employ whichever set of tables that accompany the tests.
Best wishes for 2017!
Dick Clarke, President
National Board of Diving & Hyperbaric Medical Technology
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Updated February 20, 2017