Explain the concept of dive tables in planning dives.

Dive tables are essential tools used in planning dives, especially for recreational and technical scuba divers. Their primary function is to provide divers with reference data related to no-decompression limits, which are the maximum time and depth a diver can go without needing to perform decompression stops during ascent. Understanding these limits is crucial for avoiding decompression sickness, commonly known as "the bends," which can occur if a diver ascends too quickly after spending time at certain depths.

The tables typically present information in a structured format, allowing divers to quickly determine safe dive profiles based on the depth and planned bottom time. By using dive tables, divers can make informed choices about how long they can stay at a given depth while still adhering to safe ascent practices. This systematic approach to dive planning is critical in enhancing safety during scuba activities.

While divers of all levels can benefit from using dive tables as part of their preparation, they are not exclusively for advanced divers. Additionally, they do not provide information about scuba gear or apply specifically to submarine dives, which operate under different safety guidelines.