Talk:Coordinate positioning
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First figure, illustrating positioning systems, is not very useful Airy Magnien (talk) 10:19, 29 August 2016 (CEST)
Sentence "Coordinate reference systems can also be used to define schematic coordinates as they are used in terms of screen coordinates" is a bit unclear Airy Magnien (talk) 10:18, 29 August 2016 (CEST)