The GPS-MSG is a multiple output RS-170A "blackburst" and video sync signal generator that is genlocked to the atomic clocks in the Global Positioning System. The GPS-MSG quartz crystal master clock is continuously phase controlled to accurately track the time from the GPS satellites. GPS-MSG synchronized video is synchronous with all other HORITA GPS-MSG generated video signals anywhere worldwide, typically within ±10µs, independent of their location on the globe. When used with the HORITA GPS-MTG SMPTE Master Time Code Generator, the exact relationship established between the SMPTE time code and Coordinated Universal Time (UTC) allows the SMPTE time code to function as an instrumentation time code. All GPS-MSG synchronized cameras will record the same time for an event, with the exact UTC time of any television frame and line number known and the time code hours, minutes, seconds, and frames identical at any moment, anywhere, worldwide. Video frames from widely separated GPS-MSG cameras or other video sources start simultaneously and are scanned synchronously to within less than 1H time. The long-term accuracy of the GPS-MSG is derived from and equal to the world's best atomic clocks.