The NFL will test 'Hawk-Eye' technology in preseason to (hopefully!) replace first-down chain measurements

"We're in the installation phase for all of our stadiums, really getting them calibrated and up to date," said Brantley, the NFL's senior vice president and chief information officer. "We're just really getting to a place where this system is as accurate as possible and really calibrating across our multiple stadiums. ... We have multiple stadiums with multiple dimensions inside of those stadiums with different age. So, we're really just going through the installation of putting in the infrastructure and making sure these cameras are installed."