What technique can improve underwater navigation at night?

Using a compass in conjunction with light sources is an effective technique for improving underwater navigation at night. At night, visibility can be significantly reduced, making it difficult to orient oneself. A compass provides a reliable means of navigation by indicating direction, helping divers maintain their intended course. When combined with light sources, such as dive lights, divers can illuminate their surroundings, which not only aids in navigation but also enhances visibility of underwater topography, allowing for better route planning.

Other techniques, such as swimming in circles, can lead divers to become disoriented and confused about their position. Following bubbles to surface is not a reliable navigation method since bubbles can be unpredictable and do not provide a clear indication of direction. Staying close to the bottom can give divers a spatial reference in some cases but doesn't inherently improve navigation and may limit visibility further. Thus, the combination of a compass and light sources is the most effective way to navigate underwater at night.