Help Me Out is a simple APP but may save your life! Into HelpMeOut app, you can get your current location latitude & longtitude and address.
You can set default emergency contact mail and phone number, then you got 4 functions to go:
1.Check current location on Google Map
2.Send help mail to tell someone where you are
3.Send SMS message to tell someone where you are
4.make phone call to someone you set up