I find it interesting to view my position on my Navman satnav when travelling as a passenger on a commercial flight. In particular, it is amusing when the message "Warning, you are exceeding 500 mph" appears. It aids recognition of ground features which provides some in-flight entertainment.
I have been told by cabin crew once to switch it off when taking off or landing and once during the flight. At the same time, other electronic gizmos are used throughout the flight and even childrens' elcronic toys during the take-off and landing without reprimand.
My understanding is that a satnav position fixing device is in essence a radio receiver. It presumably generates no more electronic noise than other computer devices.
Whilst obviously not wishing to prejudice the operation of the aircraft's instruments, as an ex-airborne systems engineer, I cannot understand the restriction.
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