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Sometimes (rarely) navigation stops working

problem
navigation

#1

On rare occasions navigation stops working and no recalculation is triggered any more.
This week i had a similar issue as described here but with new phone

Kurviger had navigated me to munich, then throughout the day other apps had been used.

  1. The way back home: routing | actions | turn route
  2. Start navigation (automatic recalculation on )
  3. I took another route as calculated by Kurviger.
    So virtually on every intersection through munich, a recalculation was executed.
  4. Then after 10-20 recalculations no recalculation was triggered any more.

Watch the zoom level!

Stop navigation / start navigation (position same as above)

Speed indication is still working

System settings

  • Android 8.0 Samsung Galaxy S7
  • Kalman Filter on
  • recalculate route on
  • Auto-Zoom on
    • min: 14
    • max: 16
    • off route: 15

Summary

  • independent of Android version and device (Android 8 and Android 4.3)
  • Many recalculations in a row seems to contribute.
  • not reproducible so far.

Manfred


#2

Thanks for the report!

There, the rerouting was enabled and was not triggered?
How was internet connection, any (spoken) warning?

During all these, the screen was turned on or app was in background?


#3

Yes, exactly. At this time navigation had been stopping working for maybe ~15min/~10Km.
Even after “stop/start navigation” no rerouting was triggered (as you can see on screenshot).

Later (at ~16:03) I stopped the app (double back) and started again.
After that the route was instantly recalculated and navigation was working again.

Screenshot says 4g :wink:
No warning I could remember of, and munich usually has excellent internet coverage.

Hmm, one thing that might be contributing:
The start point on the screenshot was the last time a successfull recalculation had been taken place.
After that I was traveling through a longer tunnel. So no GPS for some time (I think there has been a warning about missing GPS)

Screen was on and app in foreground the whole time from “point 1.” onwards.


Make app more tolerant of GPS loss in predictable situations
#4

@devemux86 just a thought:
What happens if you loose GPS signal (±) at the very moment you would detect an off route situation?
Maybe in combination with Kalman filter?


#5

The off route detection is only triggered when getting off route significantly. So, short GPS signal loses are usually not an issue. Longer tunnels, might be detected as off-route though.


#6

In case it’s relevant, I try to make my above answer more precise:
Screen was on and app in foreground from “point 1.” onwards of the above report.
Before “point 1.”, during the day, the app had been “running” in the background most likely (navigation off).

Manfred


#7

Ich hatte gelegentlich das gleiche Problem. Manchmal stoppte kurviger pro während der Fahrt. Fast immer nach Pausen, wenn also GPS abgeschaltet wurde, um Strom zu sparen. Man kann es sehen, weil keine nächste Abbiegung mehr angezeigt wird etc. Da hilft nur noch Beenden der app und Neustart, dann geht alles wieder.

I occasionally had the same problem. Sometimes kurviger pro stopped while driving. Often after breaks when GPS has been turned off to save power. You can see it, because no next turn is displayed, etc. You have to quit the app and restart, then everything works again.


#8

Thanks for the feedback,

Can you describe that workflow, how GPS is turned off?
By user or battery optimization, app is still active or in background?