Hi, thank you for your help. I am owner od thé farm, I have no good skills with computer. Problem rised up last week when a mum with two little children walken into my field with cattle. I asked her how it's possible and she answered that they walked in because od navigation. Likely all cows were in a barn at that moment but I realized how danger are all navigations that let people walk into private yard with animals . It's do danger !!!!!! So I decided to do something about IT before some sad accident happen. Thanks. 