I had been experiencing GPS issues from the first day I bought the Nexus 7-2B16. I tried several things, but the GPS systematically stopped working eventually.
Today, I'm cautiously optimistic: Running OTA build JSS15Q, I drove to the airport (25 minutes, 30-some kilometers) then had the GPS running for another 30 minutes in flight, and finally drove back home. I did not experience any GPS problem. I'm going flying for longer tomorrow. I'll report my findings.
If this damning issue is finally fixed for good, I'll be very happy with my first-ever tablet (or "touchy" device of any kind!)