Around the World Flight, 1938

And I wouldn't say the first integrated radio navigation system or the first inclusive instrument panel... I think you can say that the radio equipment - which I did not design personally but was designed under my supervision, while my round the world flight was the first, well, I don't think you could even say first - I should say it was the best long-range radio communication system ever designed for an airplane and the entire navigation system both radio and celestial was certainly by far the most efficient ever installed or used up to that time and the navigation carried out on the flight was by far the most accurate of that performed in any long distance flight up to that time. The navigation throughout that flight around the world was so accurate that the plane was never more than a few miles off of the desired course

Utley: It was six miles

Hughes: It was amazingly accurate, and the combination radio and celestial equipment and dead reckoning systems and the entire system and procedure of navigation was amazingly effective and efficient but I don't think it's right to say it was actually the first of anything on here...