I have a Phantom 3 Advanced and a Samsung Tab 4 tablet (7 inch).  The Samsung tablet has the Android 4.4.2 Operating system.
ever since the latest firmware and DJI Go app update i cant mark my home point.  
i can change it to OPTI and ATTI but GPS doesnt work.

Can any one help on this?

Hello PJElrick, since Samsung Tab 4 isn't in our recommended list.
Could you please try to change another mobile device to test it again?

You are trying it outside where GPS reception should be good ?