I am learning about digital mapping and GPS. I am using the OS maps app, I haven’t paid for any maps yet. I went for a local walk to test things. Opened the app and pressed Record a route, no problem. So as I walk down the street and leave town I can see the app location arrow is recording my walk. When I leave town and follow the footpaths through the fields I have another look at the phone and the location arrow is pointing about 2 miles away from where I am standing . The arrow then just moved around the screen to random locations and didn’t follow me even when I re-entered town. I know that the phone, a Huawei P8 Lite, is basic and 4 yrs old but still expect it to be up to the job. The location settings are on GPS, mobile data or WI-FI. I have spoken to a couple of people, who know a lot more about Digital routing but they are stumped. Any suggestions, please?