What book is the Book of Changes about and what is the compass for? Is it used for fortune telling?

The Book of Changes, also known as the Book of Changes or the Book of Changes, is the source of natural philosophy and ethical practice in China's traditional ideology and culture, and the oldest primitive divination in China, which has had a great influence on China culture. It is said that Fu He (Ji Chang) summed it up according to the river map and Luo Shu (which also produced the Eight Diagrams of the Book of Changes). It is the crystallization of China's 5,000-year-old wisdom culture and is known as "the head of the group classics and the source of the avenue". In ancient times, it was the study of emperors and a compulsory skill for politicians, strategists and businessmen. The Book of Changes is essentially a book about divination. "Divination" is to predict the development of future events, and The Book of Changes is a book that summarizes the laws and theories of these predictions.

See the Book of Changes Baidu Encyclopedia for details.

That's not a compass, it's gossip.