If your GPS location isn't accurate when viewing the navigation, your instrument cluster will switch between two directions 

(N & S), and possibly showing you driving relatively close, but may be haywire at times, please see below:

 This is a cluster problem that can be easily fixed by disconnecting the GPSM. 

The GPSM is typically under the center speaker grill.

This image is just an example of where to find the GPSM. Your vehicle may be different. Your owners manual can usually tell you where it's located.  

If you're still having issues, please feel free to open a ticket, or reach out to the support department directly.