Vehicle tracking is an old trick at this point, but that's not to say there's no demand out there in the enterprise space. Announced today, the TeleNav Vehicle Tracker has been added to the carrier's portfolio of enterprise mobility services. Said GPS-enabled device can be hard-wired or embedded onto a vehicle to provide "companies of all sizes with a hassle-free method for monitoring and managing fleet operations." Specifically, it can log and report via email or SMS (on AT&T's network, obviously) when an employee violates an established policy (speed, stop time, mileage, etc.) and provide "detailed information about vehicle activity, including whether the engine is turned on or doors are open." The tracker will run customers a whopping $399, with a monthly service fee of around $34 (yes, for each device). In other words, you better be really suspicious before diving into this.