Have had n5 since launch, never had issues with the GPS, but I never drive so I'd never used navigation. Tried for the first time today and it was completely messed up.

Whenever I'd move with navigation running, it thought I was pointing in the wrong direction, couldn't follow me and had no idea where I was once I moved ~ 100 ft. As soon as I canceled nav, it would zero in immediately. Start nav up again, went bonkers. I was able to use navigation by just looking at the next direction, and then stopping and restarting nav every time i made a turn.

I'm running action launcher, but tried stock as well. Same problems with Google nav and with waze. Not sure if it matters, but I've got a T-Mobile sim.

Any ideas?