The thing is, that there are hiddent tasks witch should activate when player is near (If I got it right). This means gps is needed all the time. Even if it's not, then I don't know exactly when it should start. It doesn't seem right if the user has to wait for gps every time he clicks on submit button. Prompting user about gps is considered in ux spec and I already made it, I didn't updated it yet because there are other things missing. My main reason of putting it here before finishing was to discuss when gps should be activated.