How do I increase geolocation accuary

I use c2 geolocation templates and i run this App on few devices only one device will show right location

Construct2 gets the geolocation information from the device..

LittleStain why other device has better accuary than other device? Why all devices when use original google maps app have high accuary but on app crafted on c2 has diferent?

Google Maps sometimes uses local wifi signals to help triangulate your position more accurately. The Geolocation object uses the browser's geolocation service, which uses the OS geolocation service, which may or may not include wifi signal information.

Other than that, if you want better GPS-based accuracy, buy a big aerial and carry it around with you, or launch some more GPS satellites