What is the function of dive reels during wreck dives?

Dive reels play a crucial role in wreck diving primarily by aiding navigation and marking the exit path. When exploring a wreck, visibility can often be limited, and the environment can be complex, making it easy to become disoriented. Using a dive reel allows divers to lay a line as they descend and navigate through the wreck, creating a clear reference point to follow back to the exit.

This line can also help mark the route taken within the wreck, which is particularly beneficial in complex structures or when exploring multiple compartments. By following the line, divers can easily retrace their steps, ensuring a safe return to the exit point even in low visibility conditions.

The other choices don't align with the primary functions of dive reels. For example, they do not indicate depth, serve as weights, or measure time spent underwater, which are achieved using different tools or equipment. Thus, the correct function of dive reels specifically focuses on enhancing navigation and safety within the wreck environment.