- Dive computers can read the pressure around a diver, the elapsed time of the dive and ascension, and can warn a diver when she is ascending too quickly. Some dive computers also read the temperature of the water and the amount of air left in a diver's oxygen container.
- Since divers cannot be expected to view their dive computers all the time, an audible warning is given at certain times. This occurs during missed decompression spots, exceeded oxygen toxicity limits, and when maximum operation depth has been reached.
- Dive computers look like watches and are worn on the wrist. They display everything digitally and are composed of materials able to withstand high pressures.
- Dive computers allow divers to plan even the most complicated dives. They greatly reduce the risk of harm that could otherwise occur if divers do not keep track of time, oxygen levels or rates of ascent.
- Many divers perform dives well out of the range of their expertise by relying heavily or completely on the dive computer. If a dive computer stops working during a dive, the diver must know how to safely ascend on his own.












