Navigation techniques usually include use of all except

Navigation techniques for divers typically rely on several key methods and tools that assist in orienting oneself underwater, helping to avoid disorientation, and ensuring safe travel to and from dive sites.

Using a compass is one of the most reliable methods, as it provides a consistent reference to cardinal directions, allowing divers to plot a course and navigate effectively. Similarly, natural features like rocks and reefs serve as reference points, helping divers gauge their position relative to known landmarks. Sand ripples can also be significant, as they often indicate current directions or past movements of the water, allowing divers to make judgments about their path and orientation based on the natural landscape.

In contrast, fish are not typically considered a reliable navigation technique. While divers may observe fish and other marine life as part of their underwater experience, they don't provide consistent or useful direction for navigation purposes. Fish may be present in varying locations and their movements are not predictable in the way that natural formations or navigational tools are, making them less effective as a navigation aid.