I researched before buying but I guess I looked in the wrong places. Bought the Nexus 7 (2013) for use as a PDA and Sat Nav. Immediately found that the GPS lock drops out all the time on NavFree and various GPS tracking tools. Loaded JSS15R but still have problem. There are 22 satellites visible starts of using 14 then drops to 0, cant find magnetic North. Is this just me or did JSS15Q solve things for everyone else and I need to send the unit back for replacement.