The S-911 Vest from Laipac Technology is chest armor with brains. Just as phones have evolved to handle a gazillion different functions, this bulletproof vest has sprouted a GPS system.
Law enforcement, military, security personnel, and VIPs are the target market for the high-tech vest. Built-in GPS provides real-time tracking with location, heading, and speed.
The vest's most important function is to stop bullets, of course. Kevlar and optional armor plates handle that task. The basic Kevlar model has enough stopping power to protect against most handguns, including a shot from a .44 Magnum.
The vest works over a GSM/GPRS network and will record waypoints when out of GSM range. Set up a virtual geo-fence and get alerts when the vest moves in or out of a certain area.
You could do all that with a regular GPS tracking system, but the S-911 also has a built-in G sensor that sends alerts when it registers an impact or a man down. All this extra equipment means the vest comes with its own battery charger. You might want to pick up a car charger adapter for your bulletproof Mercedes.