ISS Test Calendar App
I've deployed a test app for downloading NASA's Spot The Station sightings as an ICS calendar.
There's no fancy front end yet, just a URL Scheme that follows:
/place/Country/Region/City
or /place/Country/City
e.g.
Sometimes a region is needed, other times not. For now, just use the NASA App to find the correct name hierarchy for your city.
Note: I threw this together quickly. It works, and well enough to share, but it's still at a very early stage.