Why did the Feng Shui master's compass stop?

The compass software downloaded directly from mobile phone and pad is not allowed and will stop. It may stop because the software itself is not good and there are many loopholes. In addition, it may also be because the mobile phone runs too many programs and can't afford the load. But this may be the first reason. Even if it is accurate, then the final degree deviation of the mobile phone compass will only have serious consequences for Feng Shui judgment. We should know more about making electronic geomantic compass, including magnetic field correction function, anti-magnetizing function, laser lamp positioning, GPS ranging function and so on. , is not a mobile phone software can solve.