If your post-run map in URUNN shows you running through buildings or zigzagging across the street, you are experiencing "GPS Drift" caused by an urban canyon effect.
Tall buildings reflect satellite signals before they reach your phone or watch, causing the GPS coordinates to scatter. This can result in URUNN recording a faster pace or longer distance than you actually ran.
How to improve GPS accuracy in the city:
Wait for a strong lock: Before pressing 'Start' in URUNN, wait 30-60 seconds in a clear open space (like a park or intersection) so your device can lock onto multiple satellites.
Use a multi-band GPS watch: If you regularly run in dense cities, syncing a multi-band/dual-frequency watch (like newer Garmin or Coros models) to URUNN will provide vastly superior pace and distance accuracy compared to a smartphone.