Instead of calling each member of your family and all of your friends individually when you find yourself without a roof or wading through four feet of water, use the Red Panic Button app. You set up a list of people to whom the app will send panic email and text message. When pressed, the app will send your coordinates to your list of emergency contacts. You can also configure the app to work with Facebook and Twitter, if you think that would be faster.
Red Panic Button