The app doesn't track orientationchange when the phone is flipped

When I flip the phone (iphone 6 plus, ios 9) from portrait mode to either of the landscape orientations, the pointer points to 90 degrees in the wrong direction.

In the images below, the phone is always in the same position on my desk. However, what the browser considers the "top of the screen" is either the camera end, or one of the long sides. The app, however, always draws the pointer as if the camera end is still the top of the screen.

I'd be interested in trying to fix this myself, as an Elm learning challenge.

krisajenkins / beeline-demo

The app doesn't track orientationchange when the phone is flipped #2