Thanks all for the feedback and links provided, I appreciate the efforts.
However, I am still a little unclear about this.
FAR 121.306 does not refer to a particular stage of flight and therefore implies that at no stage can a PED be operated in flight (with the exceptions listed)?
FAR 121.542 is logical in prohibiting non essential duties during critical phases of flight. But the reference to a “personal wireless communications device” upon further exploration relates to “commercial mobile services, unlicensed wireless services, and common carrier wireless exchange access services” (332(c)(7)(C)(i) of the Com- munications Act)
Im not sure this really applies to non cellular blue tooth and wi fi that many cameras and GoPros have?
And FAR 121.542 refers to “duties” and “activities” under taken during critical phases of flight however a fixed GoPro suction cupped to the rear window does not require any operation from the pilot once it starts running and can be start and forget from cruise level to the gate.
Im just spit balling this and sorry to split hairs.