As your car is parked in the garage at the office, someone breaks your window and swipes your GPS. They also swipe your garage door opener. They then drive to your house (thanks to the help of your GPS) and open your garage while you're at work. They can then help themselves to what ever you own, and leave without arousing suspicion.
So what should you do, you're probably asking yourself. I suggest going to the nearest gas station from your home, a fast-food restaurant, or some place far enough from your home but so that you know where you are and set that as your home. This measure, although simple, will keep some thief from possibly being led straight to your home.