View behind the mobile screen: 3D dissection of a golf app user interface.
The red warning flag is normally hidden by the frame above. If GPS reception is bad, the flag is rotated into view. #usability
Why is this better than a simple bar indicator used for GSM reception?
1. Because the UI is not cluttered when reception is ok.
2. And if location is not precise enough, the animation of the red flag easily catches the user's attention.
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[Image produced with reveal app]