All electronics have some degree of EMP proection. That said, here's some more:

1) The degree of protection varies in commercial stuff and is not as protected as military equipment.

2) Any nuke or EMP attack will be geared to produce a strong enough pulse to nullify military grade shielding.

3) It is like surviving a nuke attack, the farher away from the NUDET, the better your chances of survival are.

4) Being inside of buildings, a cave, etc, when the attack occurs will provide some additional shielding but generally speaking, if your equipment is within the Line of Sight of the attack, your equipment will probably be fried. The greater the altitude of the NUDET or EMP Bomb, the greater the range that the EMP will have on equipment from it's detonation position.

Summary: It's a crap shoot on whether your equipment will be affected or not,,,Good Luck!