The best context I could put my understanding of 'geotagging' is when you upload photos on facebook and it asks you where the picture was taken and you put in the geographical pinpoint reference to that photo. When you later review the locations where you took photographs, it becomes an interesting visual display of places you have been to and the photos that made them memorable.
I have used Google Maps and Google Earth tools. I have also looked at using the "Map my Walk" app on the iphone to see what routes I have taken on my daily (ahem!) walks :)
Great- and again, having options for mapping tools and knowing that they exist can help researchers that you are working with.
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