android tracking app
no longer on Google Play
Google Play removed this app after a year of it being in the store. Their reasoning was it allowed serendipitous tracking but wouldn't say what I needed to change to allow for it to remain in the store. So I just let them remove it.
There are other apps with almost identical feature sets including Google's own Trusted Contacts app. Feel free to use those.
Lesson learned: if you create software for someone's walled garden be prepared for them to remove it and not help you get it back up.