Determining the Letter Group After a Surface Interval
Surface Interval Table
Table 2: Surface Interval Time
To determine your new letter group following a surface interval, you begin by locating your end-of-dive letter group from your previous dive. Next, you follow that column down to the cell that contains the time span that includes your surface interval time. Finally, follow that row to the left to find your new letter group.
Surface Interval Rules Surface Intervals Topics Dive Tables & Computers Lessons Determining the Letter Group After a Surface Interval 2
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