Repetitive Dive Letter Group
Table 3, repetitive dive times
Table 3: Repetitive Dive Time
You may have noticed that Table 3 does not provide end-of-dive letter groups. To determine your end-of-dive letter group following a repetitive dive, you need to return to Table 1.

When determining your letter group for a repetitive dive, you need to consider the residual nitrogen from your previous dives. So instead of using your actual dive time to determine your letter group, you'll use a figure called total nitrogen time.

You calculate your total nitrogen time by adding your actual dive time to the dive's residual nitrogen time. So let's first look at how to determine your residual nitrogen time.