Not sure if this will help you, but I also had GPS problems with my tab 4 7 wifi only. I purchased the tab in CA., worked fine. Downloaded some maps and used it to navigate, no problem.
When I got home to Brazil, the GPS did not work. Downloaded several apps to check the satellites I was picking up, l was getting 1 maybe 2, with very low signal.
I then found an app Faster GPS, this allowed me to change the satellite search location to South America, Brazil. Major difference, l now pick up 14 satellites and the GPS even works downstairs.
Sent from my SM-T230NU using XDA Free mobile app