When the apocalypse comes, don't be that guy who gets left behind because you forgot to tell someone where you were going. Make sure to leave a note on your door so your loved ones know you're off to save the world, or at least your favorite coffee shop.
Also, don't forget to set up a 2-way communication system with your fellow survivors. You know, for emergencies. Like when someone gets bitten by a radioactive spider.
And, of course, make sure to tune in to Ham Radio 101, because AM/FM won't be enough to save your skin when the world is burning.