Nitpicks
Is it worth it to mention that, in regard to electronics working after the EMP, there are perfectly valid reasons?

All that works after the EMP are the video camera, the 2 vans, the ferry, and military equipment.
Electronics that are off at the detonation of an EMP are much less susceptible to damage, so it's presumable that the video camera was grabbed after the destruction started and turned on then.
The first van was fixed by Ray, and the second news van was far away from the EMP.
The ferry was also far away from the NY EMP.
Military equipment, whether it was near the EMP or not, are constructed to be much less vunerable to EMP's, so its understandable that they would work.
Just some thoughts.