I downloaded Pokemon Go 10 days ago and I caught my starter pokemon. After that the application gave me the following error message:"GPS signal not found" and the map won't load, so I just stand in a blue screen.
Some of my friends have the "GPS signal not found" error message too and suggested I download GPS enhancing apps. At first the GPS enhancing apps didn't work, but after I deleted and reinstalled my Pokemon Go app it works normally. Now Pokemon Go still showing "GPS signal not found" with a blue screen instead of a map of the area I am in.
I've tried downloading the offline maps, but that just didn't work.
Best Answer
Do not download any other application that involves GPS. For playing pokemon Go, you only need to download that app. Some third-party apps makes your Pokemon Go malfunction. I suggest reinstall to have a clean app after the GPS enhacing apps.
Also, the google maps offline option is not proved to work.