How does an orbit tracker work?

Could you elaborate on the mechanisms of an orbit tracker? How does it track the orbit of celestial bodies, such as planets and satellites? Is it a sophisticated piece of technology, or does it rely on simpler principles? Additionally, how accurate are these trackers, and what factors can potentially affect their precision? Is there a specific method or algorithm used to calculate and predict the orbits, or does it vary depending on the tracker's design and purpose? Lastly, are there any limitations to the use of orbit trackers, and are there any ongoing advancements in this field?