my S3's GPS not working

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http://forum.xda-developers.com – hi guys i have been testing my galaxy s3's GPS. i am using osmand app as my GPS app. sadly the app could not find any satellites and pin point my current location. even if i leave my S3's GPS active for a more than 5 minutes it could not get any satellites even if i am standing on a open area. what should i do? how can i reset my GPS? thanks in advance (HowTos)