This is side project. From requirements side was only that it should be a traveling app. So I wrote short requirements. Who is the target audience for this app. The logic behind the app, where we get information for app, what information we get and what information we send to the server. I made a table with fields (Name, description, and logic). When all this information was ready I started to make mock-ups in UXPin, Balsamiq. And finally I translated them in high definition mock-ups in Illustrator. The work isn't yet finalized. I'm still working on it. It's just a snapshot of what is ready right now.