I suggest to define a tag like <youtube> called <geo> that can handle decimal as well as minute/second longitude and latitude coordinates, e.g. <geo>49.5000#-3.5000</geo> and <geo>49°30'00''#-3°30'00''</geo>, respectively.
These values should then be parsed to Google Maps or any other provider of free web geo services.
Possible user cases would be gps-tracked images of a trip, discussion of restaurants, ...




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