Which device calculates your remaining allowed bottom time during a dive?

Which device calculates your remaining allowed bottom time during a dive?

• A. Depth gauge
• B. Watch
• C. Dive computer
• D. Compass

Answer: (C)

Calculating remaining bottom time depends on tracking how nitrogen builds up in your body as you stay at depth. A dive computer does exactly that by continuously monitoring your depth and time and using a decompression model to tell you how much no-decompression bottom time you have left at your current depth, updating as you change depth or ascend. This real-time calculation lets you plan safe rises without decompression stops. In contrast, a depth gauge only shows how deep you are, a watch only tracks elapsed time, and a compass provides direction; none of them computes how much bottom time remains.

Calculating remaining bottom time depends on tracking how nitrogen builds up in your body as you stay at depth. A dive computer does exactly that by continuously monitoring your depth and time and using a decompression model to tell you how much no-decompression bottom time you have left at your current depth, updating as you change depth or ascend. This real-time calculation lets you plan safe rises without decompression stops. In contrast, a depth gauge only shows how deep you are, a watch only tracks elapsed time, and a compass provides direction; none of them computes how much bottom time remains.