Latitude and Longitude

http://en.wikipedia.org/wiki/Geographic_coordinate_system 

Net
http://www.latlong.net/

Find
http://www.findlatitudeandlongitude.com/

Slides
http://www.slideshare.net/search/slideshow?searchfrom=header&q=latitude+longitude 

Tube
https://www.youtube.com/results?search_query=Latitude+and+Longitude