GPS tracking system

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http://androidforums.com – Hi, everyone here i have some problem hope one can help me..:o i'm a student and i receive a project from school that required making a gps mobile tracking system, this is used for locate the location of children and elders... it has friend request feature, but i don't know how the verify the respond from one another..at the same time, it also has check-in feature.. and i like to know how the data flow in this system, do anyone have the resources for these? thanks for reply~:) (General)