Question

A diver using EAN32 makes a dive to 33 msw (110 fsw) for 23 minutes. After a surface interval of 2 hours, they make a second dive (also using EAN32) to 23 msw (75 fsw). Using NAUI EAN32 Dive Tables, what is the adjusted maximum dive time for the second dive?

Answer 1

To calculate the adjusted maximum dive time for the second dive using NAUI EAN32 Dive Tables, we need to follow these steps:

1. Determine the group for the first dive:

- Depth: 33 msw (110 fsw)

- Time: 23 minutes

According to the NAUI EAN32 Dive Tables, the group for this dive is E.

2. Calculate the surface interval:

- Surface interval: 2 hours = 120 minutes

3. Determine the residual nitrogen time (RNT):

- RNT for group E after a surface interval of 120 minutes is 5 minutes.

4. Determine the group for the second dive:

- Depth: 23 msw (75 fsw)

- Adjusted no-decompression limit (ADL) for group E at 23 msw (75 fsw) is 50 minutes.

- Adjusted Maximum Dive Time (AMDT) = ADL + RNT

- AMDT = 50 + 5 = 55 minutes

Therefore, the adjusted maximum dive time for the second dive using EAN32 after a surface interval of 2 hours is 55 minutes according to the NAUI EAN32 Dive Tables. It's important to note that these tables are just one tool to help plan safe dives and should always be used in conjunction with other safety measures and considerations.