How does a dive computer aid in dive planning?

A dive computer is a critical tool in dive planning as it provides real-time depth and time information, which are essential for safe diving practices. This real-time monitoring allows divers to track their current depth and dive time, ensuring that they remain within safe limits and adhere to predetermined no-decompression limits.

The ability to monitor depth can help divers avoid exceeding their planned dive profile, while the time information aids in managing bottom time effectively. This is particularly important for avoiding decompression sickness, as it helps divers make informed decisions about ascent rates and safety stops based on their actual dive conditions.

In contrast, the other options do not accurately represent the role of a dive computer. For instance, while dive computers help manage decompression by tracking dive profiles, they do not provide a guarantee against decompression issues. Additionally, a dive computer does not replace the need for a buddy; dive buddies are crucial for safety and support during a dive. Lastly, dive computers do not automatically adjust buoyancy; divers must manage their buoyancy through the use of buoyancy control devices (BCD) and proper weighting.