How to determine the location of geomantic omen in field survey

It's easy to tell directions with a compass in an apartment. Second, use a compass. If you don't have a compass, you can find a steel needle for sewing clothes, find a speaker (with audio equipment) and grind it on the magnet at the back, and hang it with cotton thread to distinguish the north from the south. Secondly, look at the sun and judge it according to the time and the position of the sun. The last method is to find the Polaris in the clear night sky to locate it, which is also very accurate.