Donr wast time searching through your address book!
If you need help, you need it now.
Just tap Call and select one of the predefined contacts.
But its even better: Tap Text or Email, select one of the predefined contacts and select one of the predefined situations.
Your contact will be notified instantly that you need help. And they know exactly where you are because the message not only contains a little map, it also contains a link to Google Maps.