In limited visibility or unfamiliar areas, what tool may assist in locating the ascent line?

Using a compass is beneficial in limited visibility or unfamiliar areas because it helps divers maintain their orientation and navigate effectively. Navigating underwater can be challenging, especially where visibility is reduced or when the dive site is not familiar. A compass provides crucial directional information that can guide divers toward their planned ascent line, ensuring they can find their way back to their reference point or safety while ascending.

In contrast, while a depth gauge indicates how deep you are, it does not aid in navigation towards the ascent line. An underwater flashlight can illuminate surroundings but may not help in determining direction, especially if visibility is restricted. A dive computer monitors depth and time during the dive but does not provide navigational support. Therefore, a compass is the most effective tool for locating the ascent line in such conditions.