How to prevent substitution of the user's actual location?

Question

Google Maps

Objects on the map are displayed depending on the location of the user, within a certain radius from him.
Its location is taken from the rickquest:

user_location = map(float, request.args.getlist('userLocation[]'))

here is a video showing how to change your coordinates in the browser.
How can you prevent the user's actual location from being spoofed? He should not see objects that are not assigned to him. The method of obtaining the user's location can be changed as needed.

Answer 1

As far as I remember, there was such a toy, Ingress.
She checked for the presence of ups that allow you to change geolocation.
But in the browser ... I think it will be unrealistic.