The app Life360 works well. As a female who travels alone worldwide, the app makes it easy for my family to know exactly where I am. If something were to happen to me, there is a shot that I can be found. My teen has the app too. When his car broke down in the middle of the night, we were easily able to find him and help.
We do not use the app as a way to spy on each other but instead as a way to stay safe or help one another.