this is mostly for people with jailbroken iphones but it is a very cool tweak. it is called Send my location. lets say you went on a hike today and fell and broke your leg and your off the trail quite a bit no one is gonna find you easily. but with this app you just open your sms app and click send location at the top and pick who you want to send it to and you can write a message saying you are injured or what ever has happened to who ever you chose and they can get you help asap. here is a link to the website that has all the information on the app Never Be Lost Again With 'Send My Location' For iPhone [Cydia Tweak] | Redmond Pie i am sorry for the very long post but i figured this was some thing that could help alot of people out and give you that piece of mind knowing that you are a little safer with what ever you are doing.
lol im not affiliated with them at all. i just figured it was a cool app and every one should have it