What is defined as following someone or something by stringing together a continuous chain of their sign?

The term that accurately describes the process of following someone or something by stringing together a continuous chain of their sign is tracking. In the context of search and rescue operations, tracking involves interpreting and analyzing various signs left behind, such as footprints, broken twigs, or disturbed underbrush. This helps rescuers understand the direction and movements of the subject they are trying to locate.

Tracking requires keen observational skills and an understanding of how to interpret the signs of movement in the environment. This is crucial in search and rescue scenarios where the ability to follow a trail accurately can determine the outcome of locating an individual in distress. By following these signs continuously, rescuers can piece together a narrative of the subject's path and make informed decisions about where to search next.