Before we begin using Table 3, let's cover some important terms used throughout this chapter.

The duration of a dive completed, from descent until surfacing. If a safety stop is performed, that time does not need to be included in the actual dive time.

The amount of time you consider as having already spent at the planned depth when planning a repetitive dive. This figure is based on your residual nitrogen when beginning a repetitive dive.

The sum of the actual dive time and residual nitrogen time. This figure is used when determining the end-of-dive letter group following a repetitive dive.

The maximum no-decompression time limit for a repetitive dive. This figure takes into account your residual nitrogen when beginning the dive.