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Just out of curiosity, how accurate is accurate enough? I have been reading various posts (mainly LinkedIn) etc on GIS and GPS location services etc and it is very easy to be seduced (if I can use that word) at the thought of using our mobile phones to record our locational details. Is 3-5m accurate enough? In terms of telling us where we are - probably. In terms of indicating a tree - arguably yes. In terms of recording the tree location- arguably not In terms of recording the tree location to be used as a future positioned asset- defintely not However, is using smartphone as a positional locator any better than marking on a map from 10 yeras ago? Or recording an offset from a street light? or corner of a building? Personally, I fear that we building a huge data correction time bomb using smartphones as accurate positional instruments - one that cannot be easily diffused. (profund)