metal

I am kind of scared to fly at night. I don't have the money to blow on a professional drone light or beacon. I have a metal flashlight. I was wondering if the metal flashlight would interfear since it's metal. Will it interfear. Thank's for the help.

When doing an IMU calibration I am aware that the surface must be exactly level and the colder the better. But what about surrounding interference like metal and wireless home routers, can these external forces have an effect when doing an IMU calibration?