The various gadgets in a car, such as a sound system, laptop, mobile phone, and headset, can be made to communicate with each other through Bluetooth. Someone sitting in the back seat can compose e-mail on the laptop and send the mail through the mobile phone without physically connecting the two. A person can hear the music emanating from the music system through the headphones, again without a wired connection.As shown in Figure 7-3, the devices in the car will form a PAN or a personal operating space. If the car has a navigation system with a GPS (Global Positioning System) receiver, it can send the instructions to the driver on the headset without wires.