Corrected entry: The EMP that brings down the chopper for some reason has no effect on the circuits of the remaining nuke, nor or Deakins' watch which he continues to use afterwards. It would fry them irrespective of if they were turned off or not; similarly the same effect would prevent their jeep from working afterwards.
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Correction: If a electronic device is off, an EMP has no effect. John Travolta is shown turning his watch off just before the nuke explodes. As the effects of radioactive material at close range is worse on electronic than an EMP, the nuke's electronics are protected from it plus an EMP. (Same issue in space, electronics must be protected from the electrons that are charged and would have the same effect). The Jeep has no real electronic components that would be fried that would prevent it from running, even though John turns the Jeep off too.
It does not matter if an electronic device is off or on; any device within the EMP zone will be rendered useless.
Anthony Lemons