A repetitive dive is defined as any dive:

A repetitive dive is defined as any dive:

• A. Made within 48 hours of a previous dive.
• B. Both the first and third answers are correct.
• C. In which your computer indicates there is residual nitrogen left in your system from a prior dive.
• D. Made within 24 hours of a previous dive.

Answer: (D)

A repetitive dive is defined by timing: if you dive again within 24 hours of a previous dive, it’s considered repetitive. This matters because nitrogen left in your tissues from earlier dives affects how you plan subsequent dives—the remaining nitrogen load influences surface interval requirements and no-decompression limits for the next dive. Waiting more than 24 hours allows more nitrogen to off-gas, making the next dive a fresh dive with its own calculations. The option stating 48 hours is incorrect because it exceeds the 24-hour window; the option tying it to residual nitrogen is contextually related but does not define the timing; and the idea that both the 48-hour window and residual nitrogen define repetitives is not correct. So the correct concept is a dive within 24 hours of a previous dive.

A repetitive dive is defined by timing: if you dive again within 24 hours of a previous dive, it’s considered repetitive. This matters because nitrogen left in your tissues from earlier dives affects how you plan subsequent dives—the remaining nitrogen load influences surface interval requirements and no-decompression limits for the next dive. Waiting more than 24 hours allows more nitrogen to off-gas, making the next dive a fresh dive with its own calculations. The option stating 48 hours is incorrect because it exceeds the 24-hour window; the option tying it to residual nitrogen is contextually related but does not define the timing; and the idea that both the 48-hour window and residual nitrogen define repetitives is not correct. So the correct concept is a dive within 24 hours of a previous dive.