How to judge whether people who look at Feng Shui are true or false?

The first geomantic omen is based on Zhouyi, in which the Eight Diagrams of Luoshu River Map are widely used and have a certain theoretical basis. Secondly, there are sects. You can ask each other what to study. At present, it is mainly eight schools with Kong Xuan. Those who really look at Feng Shui must use a compass. They don't even have a compass. They can't sit in the right direction. It's all fake.