What are some alternatives?
When comparing Trusted Contacts and sup, you can also consider the following products
Glympse - Glympse is the easy way to safely share your location in realtime. No sign-up needed.
Zenly - Zenly is a GPS tracker to locate your friends in realtime.
Life360 Family Locator - Life360 helps manage the chaos of your daily family life and lets you know:
Chill - Chill is a textless / voiceless communication app for wearables
iOS - iOS is the operating system associated by default with all Apple mobile devices.
Mutt - Add forums and commenting to your site. Unlimited posts, users and traffic, for free. Embeddable, styleable and scriptable.