Can the geomantic compass software in Apple's tablet work? Are you sure?

Tablet computers all have geomantic compass software, but none have special anti-electromagnetic interference function, so the compass reading of geomantic compass software will be affected. So if you want to use geomantic compass software, you must use a professional electronic compass. However, it doesn't matter if you just play the compass software, and if you are a feng shui master, you should mind not using the compass software in your mobile phone and tablet, which is useless. In order to use geomantic compass software accurately and normally, a professional electronic compass machine is needed.