Nice watch....but
I'm actually an aviator and bought this in part to replace the aviators watch that I formerly had, but died after about 22 years of daily use. My previous Citizens watch was also a chronograph, but had the addition of a rotating bezel, making the use of the imprinted numbers that I used as a sort of timer, while in flight easy. This watch comes with E6B functionality. But in reality, it's not very useful. First off the number are very small, and difficult to see in full daylight while stationary. They would be next to impossible to see in flight, especially in the small airplanes that I fly, due to normal turbulence and cockpit vibration. Curiously, the E6B slide rule flight calculator is left handed oriented. In that, you would either need to take the watch off to rotate the rotating E6B slide rule, put the watch on your right arm then rotate the E6B with your left hand, or do some rather interesting cross over using your right hand to rotate the dial with the mechanism on the left side of the watch. The rest of the watch is rather intuitive, but the video on this website for this watch doesn't really apply My watch also for some reason does not have lumens on the hour or minute hands nor on the 12 hour hashes. But..if you are buying this to use as a watch, it's a good one. If you are buying this to actually use as an E6B flight computer, get the JY that looks to have a bezel that can be manually rotated using either hand. I'll be sending this back, if I can. We'll see.