Ford Nav system - intermittent accuracy?

[Heelfan1]

Drove the car out from my garage this morning (cold start) and saw that the GPS was having a hard time figuring out where it was. I was driving really really slowly through the subdivision and it showed me driving through the marshes, parking lot, etc...

I switched out of Nav into some other screen, then back to Nav. It seemed to figure out where it was afterwards and never had an issue the rest of the drive. I know my Sirius/XM cuts out in my garage (it's below my condo unit) so it is possible it needed more time to lock. My Galaxy S5 had no issues.

Still believe antenna. Mine would sometimes make it 5 or six miles before loosing bearing.

 

[metroplex]

Was it a 1 piece antenna or was there a black plastic cover? See my posts above.

 

[Heelfan1]

Was it a 1 piece antenna or was there a black plastic cover? See my posts above.

Mine was a one piece.

 

[dlepak]

The navigation on my 2014 Focus ST did the same thing. It was the global positioning system module (GPSM) that went bad. They replace it and worked perfectly since then.