Cerberus. It just works.™ Message anywhere, and we mean anywhere, in the world using your iPhone® or iPod touch®. Message, track, and receive critical weather and news alerts for free using CerberTouch® with cellular or Wi-Fi access. Once you are "off grid," connect to CerberLink® via Bluetooth and stay in touch anywhere in the world using the Iridium® satellite network.
Note: Continued use of GPS running in the background can dramatically decrease battery life.