A dive computer measures water depth continuously — typically once per second — using a pressure sensor. It calculates nitrogen absorption and elimination in real time according to the diver’s actual dive profile.

The calculated results are displayed as the No-Decompression Limit (NDL) and other essential information on the screen.

Because the dive computer monitors ascent rate and responds immediately to depth changes, it is especially well suited for multilevel and recreational dives, where divers often ascend gradually while spending time at shallower depths.

In other words, the dive computer provides dynamic information about nitrogen loading and safe dive limits based on the diver’s actual behavior underwater. This makes it a highly reliable piece of equipment for modern diving.

Unlike traditional dive tables, which rely on conservative assumptions, dive computers minimize the gap between estimated and actual nitrogen accumulation. For this reason, they are particularly advantageous for repetitive diving.