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  Just had something similar to David's problem happen on the ship a couple of days ago. The new second mate called me in a bit of sweat. He had been deleting old messages from the ECDIS (Electronic Chart Display) on the Chart Table which feeds chart corrections to the two ECDIS systems by the radars. The picture on the chart table unit screen had turned 90 degrees sideways and he was looking at in shock horror wondering what he had done. I was able to set his mind at rest as he had just pressed the wrong keys. He had meant to finish off with Ctrl+Alt+Del but had pressed Ctrl+Alt and the right hand arrow key. Pressing any of the arrow keys simultaneously with Ctrl + Alt inverts the picture or turns it right or left. Feature is only included with some combinations of Windows and video cards. Microsoft included it to enable people giving presentations to invert the display from their laptops if they wanted to feed a projector mounted upside down on the ceiling. First saw this happen on the Stena Searider a few years ago when the Captain managed to press the wrong buttons and invert the display on the workstation in his cabin. When I arrived, he was trying to stand the monitor on its head so that he could finish some urgent paperwork!

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