What is the main purpose of a dive computer?

The primary function of a dive computer is to calculate dive times and limits. It continuously monitors your depth and time spent underwater to help determine safe ascent rates and no-decompression limits, which are crucial for preventing decompression sickness. By taking into account factors such as depth, time, and even previous dives, the dive computer offers real-time data and alerts the diver when they are approaching established limits.

In comparison, while navigation underwater, monitoring air supply, and assisting in buddy communication are important aspects of diving safety, they are not the primary role of a dive computer. Navigation might be performed using a compass or other tools, air supply is often monitored with a pressure gauge, and buddy communication relies on visual or verbal signals rather than computer technology. Thus, focusing on dive times and limits specifically highlights the crucial safety function that a dive computer provides to divers during their underwater activities.