Geolocation issue

Hi, the plugin is great but the “find me” button is not accurate. It does locate me more than 10km distant from the actual point. I use an iphone 4 and i’ve tried it at open air, in various points. Obviously i’ve given permission to safari to use gps, and i can see the arrow gps icon after pressing the Find me button. Thanks

https://www.ads-software.com/plugins/wp-geo-mashup-map/