Dave Tucker

10 Uses of a Smartphone for Emergency Wilderness Survival

Posted on January 31, 2016
A broken smartphone

Keys, wallet, and a smartphone are items commonly carried by people.  If you ever find yourself lost or injured in the wilderness, that phone may be your best chance of survival.  In this article I list ten ways of using your smartphone in an emergency wilderness survival scenario.

However, before I get to the list, I want to talk about ways to extend your phone's battery life.

Your phone's radios, including 4G, WiFi, Bluetooth, and GPS, are huge users of your phone's battery.  You'll want to disable any of these that you aren't using right away, if you find yourself in a survival situation.  Simply putting your phone in airplane mode may be the easiest way to disable them.  Be sure it turned GPS off as well.  Only turn GPS back on if you intend to use it.  Also, as detailed in the section "Locater Beacon", you'll want to enable your cell connection on occasion as well.

Another power hungry aspect of your phone is the display.  You'll want to dim it as much as possible, and only turn it on when you really need it.  A phone can last for days with the radios and display off.  One useful program I've found is called Twilight.  It will let you dim your display, but also turn it red, which will help preserve your night vision.

Lastly, find ways to use the phone as little as possible.  Instead of keeping your phone on non-stop as you use the GPS, instead use the map to find the correct direction of travel, then pick a major landmark in that direction and move towards it without using your phone.  Also, disable as many apps as possible that may be running in the background sucking up power.

Communication

Communication is likely your most valuable asset if your are lost or injured in the wilderness.  A quick call to 911 could save your life in even the most extreme environments.  Unfortunately, many of the places people tend to get lost or injured are the very places where communication via cell phone becomes difficult or impossible.  Here are a few tips to get a cell signal:

  1. Get to high ground.  A summit or ridge line is the best place to get a signal in a mountainous area.  Cell phones can work over very long ranges with direct line-of-sight (meaning you can actually see the cell tower).
  2. Change the phone's orientation.  Your phone probably gets its best signal when upright, but turn the phone in various directions and positions to see if you can get a signal.
  3. Charge the battery.  If you have a battery charger, use it.  If not, don't wait until your battery is too low to try and call for help.  Phones may get a better signal with a highly charged battery.
  4. Move to a clearing. Trees will interfere with your cell signal. Try and get to an area with less trees if you suspect they are the cause of your poor signal.

Even if you can't make a phone call, text messaging may still allow you to communicate.  Often an SMS message will get through where a voice call will fail1.  Also, many phones will repeatedly try to resend a message that failed delivery.  This means if you accidentally stumble in to cell coverage for just a moment, your message might go through.

Locater Beacon

If you can establish a connection with a cell tower for even a short period of time, that cell tower can likely determine your direction and distance, giving search and rescue crews a valuable place to start their search.  Follow the tips above for getting a good signal.

If you are turning off your phone or putting it in airplane mode to save batteries, make sure you periodically turn it on or take it out of airplane mode to attempt a connection.  If you can ping the cell tower even once, your chances of rescue will increase dramatically.

Maps

There are many good map programs available for smartphones.  Google Maps might work in a pinch, but for wilderness navigation, you are going to want topographical maps.  Not only will it show you where you are in relation to where you want to go, but the ability to read terrain features will let you plan out a better route than just trying to walk in a strait line.

Whichever map software you decide on, make sure you enable caching of the map data.  Remember, you may not have a data connection in the wilderness, so your map software will be complete useless if you haven't downloaded all the maps ahead of time.  In my experience, really good map programs (that allow caching) may require you to pay for a pro version, but this is the one area where I think it's worth paying.  You'll want practice ahead of time, both with using the program and reading the maps, if you are to get the most value from this feature.

Compass

Any good mapping software will include GPS functionality which will likely negate the need for a compass.  But sometimes all you need to know is which direction you are heading, and compass software may be an easier and less power hungry option, enabling you to disable your GPS receiver.  To use compass software, your phone will need a magnetometer built in, which most phones these days have.  Otherwise your phone can only tell direction while moving based on GPS, but if you are going to enable GPS, you might as well use your map software.

Flashlight

Your phone's camera flash can also be used as a flashlight.  There are hundreds of apps available to let you enable this function.  Don't pay for one, as many of the free ones do the job perfectly fine.  Just make sure the app doesn't require permissions to use anything other than your camera.  Also, get one that will allow a variety of brightnesses.

Using your flash in this way will likely eat up some battery, so use it sparingly.

Signaling

If you can't get radio communication working, you may still be able to establish visual contact with rescuers using your phone.  The glass face of your smartphone is incredibly reflective, allowing you to use it as a signal mirror.  If you see a rescue plane, helicopter, or ground search team, stretch our your arm and make a U shape with your thumb and fingers, so that your hand resembles a set of goalposts with your target in the middle.  Then hold your phone near your face in such a way that the sun hits and and reflects towards your other hand.  Sweep the sun's reflection all around so that it hits both sides of your hands (go up and down too).  If you are doing it correctly, the beam will also hit your target and they may notice you.

What about at night? At night you can use your flashlight as a signal. Some flashlight apps have a blink feature which will make you much more noticeable. Some even have an SOS feature, blinking s.o.s. in Morse code, which will not only make you more noticeable, but also indicate distress.

Lastly, if visual communication is failing, your smartphone may allow ground search teams to hear you. While you normally won't be able to make your phone produce sound louder than your own voice, if you are too weak to shout and you hear a ground search team in the area, it may be worth it to set off your ring tone as loudly as possible. Wait for them to yell your name, as directly following this event will be when they are listening for your response most carefully.

Information

While there is no substitute for wilderness survival training, having a survival manual in your phone is certainly better than nothing. These guides are generally free and cover topics like water purification, knots, land navigation, edible plants, wilderness first aid, and almost everything else you might need to know.

Again, it is best not to wait to learn this information. When you are already dehydrated is not the time to start learning how to find clean water.

Clock

A clock can be of great use in a survival situation. When paired with a sunrise/sunset calendar app, it can let you know how much daylight you have left. The timer feature can remind you to take periodic rest breaks or to turn off airplane mode to check for a cell signal. The stop watch, combined with an estimated rate of travel, can give you an estimate of how far you've gone. The alarm feature can wake you up from a short power nap.

Notes

A notebook app can help you keep track of any information you might need to record.  If you want to remember that you look a left at the last split, it's best to write it down.  You can also record any medications you take and when you took them.  Recording other medical information might be useful if you are found unconscious (be sure to unlock your phone).

In addition, journaling during your rest breaks can help you keep calm and think clearly, greatly boosting your chances of survival.

Fire Starter

It is possible to start a fire with your cell phone.  I've included this last on the list because you'd have to be truly desperate to try this, meaning you don't think you'd survive the night without a fire.  Your phone is useful for so many other things, sacrificing it to start a fire should be a last resort.

There are lots of videos on the Internet of people starting fires with their cell phones.  Some of them seem to depend on you also having steel wool...something I'm betting most of us don't carry in our pockets.  However, you can potentially get the same reaction with any thin piece of metal (which might be found by breaking your phone in to small pieces) by putting it across the positive and negative battery terminals of your cell phone's battery.  If you can't get that working, another option may be to puncture the battery, which seems to set off a reaction in some cases.  Regardless of the method, it's dangerous and destructive.  You're better off just carrying a small piece of fire steel with you at all times.

Notes

  1. https://transition.fcc.gov/pshs/emergency-information/tips.html

 

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