What technique is used when a compass is not available for navigation?

The straightedge method is a technique that involves using natural features and the environment to navigate when a compass is not available. This method can include referencing visible landmarks, such as mountains, rivers, or buildings, and using them to orient oneself and determine direction. By establishing a mental map of the area and correlating the right angles and distances, one can effectively navigate without a compass.

In situations where traditional navigation tools are unavailable, understanding the surrounding terrain and using visible markers can help maintain a sense of direction. This method relies on observation and spatial awareness, which are essential skills for effective navigation in various environments.