What are jump and gap reels primarily used for in cave diving?

Jump and gap reels are primarily utilized in cave diving to connect two permanent lines within a cave. These specialized reels are designed for placing additional line between two already established guidelines, especially in scenarios where divers need to navigate between sections of a cave system that may not be directly connected.

In complex cave diving environments, maintaining precise navigation is critical for safety. When divers encounter a gap between two permanent lines, a jump or gap reel becomes essential as it allows them to establish a continuous guideline that helps lead them safely through the passage. This is particularly important in preventing disorientation and ensuring that divers can efficiently return to their exit point.

The other options refer to different aspects of dive safety and navigation. Monitoring depth is typically done using a dive computer or depth gauge, rather than reels. While reels can aid in navigating towards an exit by providing a guideline, their primary function in this context is to connect lines, not to guide navigation directly. Storing extra air supply is managed through tanks and other diving equipment rather than reels. Thus, using jump and gap reels is a critical skill for cave divers to maintain safe and effective navigation within the intricate spaces they explore.