More than 9 million GPS and wireless devices used to manage fleet vehicles, trailers, construction equipment and mobile workers will be in use by 2015, representing a $3 billion market. According to a study by C.J. Driscoll & Associates, the growth will be led by the GPS fleet-tracking sector, which is currently seeing an annual growth rate of between 15 percent and 20 percent. This will likely continue with new government regulations that require more U.S. compa...