PHOTO BY TOM SAWYER The first lock is the hardest,but once the locator has your position it will keep up with you in five-minute blinks. The possibility of tracking workers on jobsites by remote sensing got a leg up in October with the release of a new homing device. Through a web browser used by an authorized employee, it can report a worker's location.The PocketFinder Personal GPS Locator is like a GPS-enabled cell phone—without the phone. The device uses global positioning satellites to find its location and a GSM-based cell-phone network to call that location in every five minutes. If
Arch dams, classically curved monoliths situated in narrow valleys, are not as common as other types of dams, such as embankment dams and gravity dams. ENR takes a look at some of the biggest arch dams in the world, both completed and under construction.