"There is certainly a concern. It is possible for observers to know where you are at all times, where you are going, and what you are doing."
Paul Robbins of the Univeristy of Arizona, quoted in Economic Times (Inda) in response to this question: "With so much information about people now explicitly spatialised, does GIS trigger privacy concerns?" The article goes on: "But it isn't just the government, private companies like insurance firms or other interested parties can use GIS to integrate spatial data about people's health status or behaviour in ways that are dangerous and undemocratic."
