I happen to live in an area where clear skies exist predominantly, and have had many small ISS Watch" parties outside on my patio. This app is the best for enabling those events. Not only for the excitement of the initial sighting, but it gives me an opportunity to build excitement about Human Spaceflight among people who otherwise have forgotten about what NASA is doing. Keep up the good work and BTW I am a "Massive Tipper" (see the app if you dont know what that means)