Originally Posted by
paperwastage
that's generally an issue with your gps sensor/data, not the map app. happens even with new devices where line-of-sight to satellite is blocked (eg canyon, major city like nyc with tall buildings)
Yes that's certainly a possibility although there are other possibilities as well. There was enough open sky for the GPS to at least pick up sufficient number of satellites in order to get a fix. I've used Google maps in that general area since without issues. Shortly after the event with Here maps I checked the GPS performance on the chip and did not see any issues.
Obstruction could have played a part but also an app not written appropriately can cause something like this. For example certain tasks at the physical layer should be decoupled from the main UI thread and run on a different thread to prevent hang-ups. If parts of the thread communicating with the GPS chips were on the foreground thread that could cause hangups or for things to continue like movement on a map when a GPS signal has ceased or there is a timeout. Sometimes the interaction between the software and the hardware can be complex and if the phone at the time had a newer chip that had not been thoroughly tested with the Here app there could have been uncovered corner cases.