The app ‘Red Panic Button’  sends your location via Google maps to your emergency contacts any time you press it, so you can get help for your situation. You can also set it up for email or with social media so it can tweet or post an emergency status message from your account.  It is useful in critical situations where every second counts and you don’t have time to fumble around with contacts or write messages. https://www.redpanicbutton.com/