Dan Woolley found himself in pitch blackness under a collapsed hotel after the Haiti earthquake last year. He credits his miraculous survival and rescue 65 hours later to his faith, tips from a survival reality show—and to judicious use of his iPhone. He details his ordeal in his book, Unshaken (Zondervan, 2011), including how a first aid app from the American Heart Association (AHA) saved his leg. "The app said to apply pressure to my bleeding leg, not a tourniquet," says Woolley. “A tourniquet may have caused me to lose my leg." The app also prevented him from going into shock with instructions to raise his legs above the level of his heart when he began to panic. Aside from the practical information, Woolley said the AHA app offered him confidence. "I knew I had a trusted source instead of relying on my wits."

Consider adding one of these survival apps to your iPhone, iPad or iPod touch, whether you're a survivalist, a hiker or simply want to be better prepared in an emergency.

1. The American Heart Association's Pocket First Aid and CPR

The first aid app that saved Woolley's life includes the latest up-to-date emergency information from the AHA, including instructions for CPR, choking, bites, bruises, seizures, diabetic emergencies and more. Once you download the program it's stored on your phone, so you can access the information even when out of cell phone range (a feature that saved Woolley). New features enable you to email your medical profile to a friend and add a loved one's medical information on the My Info tab. You can also save your doctors' contact information along with emergency contacts, hospitals, allergies, medications, insurance info. It also adds critical medical details to your iPhone wallpaper allowing rescuers to access essential medical information without your password.

Where to get it: iTunes
Cost: $3.99

2. Bear Grylls – Bear Essentials

An app created by the host of Man vs. Wild on the Discovery Channel, Woolley credits tips from the show for helping him survive as well. Bear shares his survival training from the British Special Forces, the French Foreign Legion and countless expeditions into the wild. The app includes tips for packing the right equipment, how to navigate, observe and snare wild animals as well as how to set up shelter, make a fire and find water. A compass tool, Bear's top 10 knots and a weather predictor may also come in handy. Consider taking his 90-question survival quiz to test whether or not you have what it takes to survive before venturing out.

Where to get it: iTunes
Cost: $6.99

3. SAS Survival Guide

Created by a former SAS (Special Air Service) instructor and soldier, John "Lofty" Wiseman developed this app based on the elite training techniques of Britain's toughest fighting force, but his survival tips can come in handy even at a national park. The app contains the full text of the bestselling book by the same name along with photo galleries of edible, medicinal and poisonous plants. It contains a Morse Code signaling device, instructions on how to survive in extreme climates, a sun compass, a survivor checklist and a 100-question quiz on your survival knowledge.

Where to get it: iTunes
Cost: $6.99 (or free if you buy the SAS Survival Guide Lite)

4. iTriage

Being away from home when a medical emergency hits can quickly become a life and death matter. Blindly driving to find the nearest emergency room or physician in a new city wastes precious minutes. Two emergency physicians created iTriage to help guide you in making such decisions. iTriage provides information on thousands of symptoms, diseases and medical procedures and then connects that information with an international directory of hospitals, urgent cares, pharmacies and doctors. "It's designed to answer two main questions," says Peter Hudson, MD, CEO of Healthagen and co-creator of the iTriage. "What do your symptoms indicate and what help do you need (i.e. emergency room, your doctor, etc.)?" It even tells you emergency room wait times for select hospitals around the country.

Where to get it: iTunes
Cost: Free

5. GoToAID

GoToAID walks users through step-by-step instructions and digital audio narration for over 400 topics broken down into 10 categories ranging from bee stings to weather-related emergencies. The app offers CPR and first aid tips including a checklist of first aid items and emergency know-how such as how to check for breathing, pulse, pupil dilation and others. An incident report allows you to record photos along with other essential information in a form for reference after an accident. An Emergency Pulse feature allows the application to send a message along with your GPS coordinates to three different people so they can locate you on a map. Also contains emergency number database for nearly every country in the world.

Where to get it: GoToAID.com
Cost: $4.99 for premium (or free for GoToAID Lite)

6. Survival Pocket Reference

Based on field manuals from the U.S. Army, Marine Corps, Navy and Air Force military forces, this app provides a quick reference guide on all things survival. Aside from first aid techniques, the app contains instructions on how to build shelters in hot and cold climates, how to navigate by a compass and the stars, how to build a fire and how to find food and water. Also contains tips for surviving a nuclear, chemical or biological attack.

Where to get it: iTunes
Cost: $.99

7. Army Survival Guide

If any operation knows survival tactics, it's the U.S. Army. This app is the U.S. Army Field Manual 21-76, titled "Survival." The app teaches you not only how to build a fire but how to build four different types of fires and cases in which each is most appropriate (one works even with wet wood, for example). It also contains the psychology of survival, shelters, basics of survival medicine, edible and medicinal plants and helps you identify a venomous Copperhead from a harmless snake. Tips for fending for yourself whether you're in the desert, the tropics, at sea or in a forest.

Where to get it: iTunes
Cost: $1.99