This documentary is so worth seeing for all the right reasons.
Very seldom do a group of brilliant individuals come together and cooperate on a project this huge and complex. Everything, including the math, had to be invented new or re-invented. Some projects are a race, this was a race of unending hurdles. The problems they over came were nothing if not mind boggling. The film throws up some charts and equations not because they'll interest you but to show you just what they had to work through. Get to one point and "oh, looks like we'll have to account for Einstein's theory on relativity". What? But they all believed in what they had, what they were doing. It may come as a surprise but these were all military Air Force officers and government contractors. Unsung heroes of a technology so ubiqitous now that we ignore it. But in 1983 when KAL 007 was shot down by a Russian fighter with the loss of all on board it was apparent to President Reagan how important the technology was, how it could save lives, and thus he determined it needed to be free to everyone. Free to everyone, to the world.
This is not the most exciting documentary I've seen but moment for moment it makes you feel good because the GPS team are an exceptional group of incredibly smart, decent, people. If you like science and technology there's plenty in the right doses with no yawn factor. Some will argue GPS was not born in 1973 and there's an argument for that which the film does not hide. I see it this way, it was the day GPS left the womb and began its journey to becoming a fully formed technology.