Which navigation aid is NOT typically used by divers?

The GPS system is not typically used by divers for navigation underwater. While GPS technology is very effective for surface navigation on boats or at the water’s surface, its signals do not penetrate water effectively. As a result, divers rely on other methods that are suitable for underwater conditions.

Sun position, ripples in the sand, and bottom landmarks are useful tools for divers. The position of the sun can help divers maintain orientation while on the surface or at shallow depths. Ripples in the sand may indicate current directions or the layout of the seafloor, helping divers understand their surroundings. Bottom landmarks, such as unique rock formations or coral structures, serve as visual cues for navigation, allowing divers to track their path and find their way back to the entry point.