A SpaceX Falcon 9 rocket was minutes from launching the new GPS III SV01 satellite, the first of a new breed of U.S. navigation satellites, from a pad at Florida‘s Cape Canaveral Air Force Station (liftoff was set for 9:21 a.m. EST, or 1421 GMT) when the company officially stood down for the day. Flight controllers had been tracking unacceptably high upper winds throughout the otherwise smooth countdown.