Dives to less than 6 m (20 feet) are considered as 6 m (20 foot) dives in NAUI dive tables.

Dives to less than 6 m (20 feet) are considered as 6 m (20 foot) dives in NAUI dive tables.

• A. False
• B. Only if deeper than 40 m
• C. Longer than 10 minutes
• D. True

Answer: (D)

In NAUI dive tables, depth steps are standardized, and any dive that doesn’t reach the minimum depth is grouped with that minimum category. Here, that minimum is 6 m (20 ft). So dives shallower than 6 m are treated as if they were 6 m for planning purposes. This keeps the tables simple and adds a safety margin: using the 6 m line for shallower dives makes the no-decompression limits more conservative than using a shallower category would. It’s not about being deeper than a certain threshold or about a specific bottom time; it’s a deliberate table convention to simplify planning and enhance safety.

In NAUI dive tables, depth steps are standardized, and any dive that doesn’t reach the minimum depth is grouped with that minimum category. Here, that minimum is 6 m (20 ft). So dives shallower than 6 m are treated as if they were 6 m for planning purposes. This keeps the tables simple and adds a safety margin: using the 6 m line for shallower dives makes the no-decompression limits more conservative than using a shallower category would. It’s not about being deeper than a certain threshold or about a specific bottom time; it’s a deliberate table convention to simplify planning and enhance safety.