The question What makes smartphones tilt-sensitive? Will they retain this ability in zero-gravity conditions? brought to mind the video of astronaut Steven Swanson's detailed tour of the ISS, in which he frequently referred to external images of the ISS using an iPad throughout the tour.
Do the iPads use their camera to judge the orientation of the user and rotate the frame accordingly, or do they rotate randomly, or is the "up" sensing function manually disabled and the orientation locked, or does iOS automatically lock the display orientation in the absence of a well-defined ~ 1g signal? (In other words, did they already think of this?)