Don't Install It If You're Traveling
Don't install the iOS 9.0.2 update if you're traveling and you're already on iOS 9.
If you are traveling today, tomorrow or in the near future, you might want to hold off on installing iOS 9 and iOS 9.0.2. You don't want to be dealing with iOS problems (camera issues, issue with GPS, etc) on a business trip or a trip with your family. And iOS 9.0.2 could definitely cause that to happen.
Our advice is to wait until you're at home base, whenever that is.