Get away from me app for iPhone and iPad

Personal mobile security alarm that you can activate when you feel in danger or threatened. The App launches a whistle and shouts out "Help. I am being attacked. Get away from me." At the same time the App lets up to 5 family and/or friends know you need help and sends them your exact location via Google maps. There is an option to silence the message if required.
You can customise the message for different circumstances, for example, "Someone is following me, please come and get me." Or "I am on my way home should be there soon."

I would love your feedback as to how to improve this App, so please leave a review.