Using a handheld GPS (TomTom) on board a/c
On a flight the other day my son asked me what would happen if we switched on the small TomTom satnav device that we use in the car.
I suppose it would work as normal but I didn't feel it was right to switch it on in flight without asking a member of the CC and to be honest I would have felt a bit stupid doing so (and I thought they would have said 'no' to be on the safe side).
I know these devices don't emit any signal so technically there is no risk of interference with avionics, but does anyone know if there is any ruling on this or what the implications are?