Dive Planning Terms
Before we begin using Table 1, let's cover some important terms used throughout this chapter.

Dive Schedule
The maximum depth and duration of a dive. For example, 42 feet for 28 minutes (or 42/28) is considered a dive schedule.
Maximum Dive Time
The time you can spend at a specific depth without being required to perform a decompression stop before surfacing.

Residual Nitrogen
Excess nitrogen in your body after a dive or series of dives that you have not offgassed.

Letter Group
A symbolic representation of the amount of residual nitrogen in your body.