And I am a big, big fan of using the modern smartphone as a disaster survival tool, which is why I have things like a spare battery and charging cords with me at all limes. 9/11 showed us that text messages can go thru when voice calls fail (makes sense, as a text is a much smaller packet of data than a digital voice call), and having smart phone means you have access to severe weather alerts, a police scanner, a first aid manual, GPS, compass, flashlight, heck, I even have the good ol' Army survival manual stored as an e-book on my phone.
Massively useful, as the saying goes.