And if you DO need to call SAR
There are quite a few things you can do to help them help you.
> Leave a trip plan with someone who can help them find you. Make sure that person understands when you will get back, and what to do if you don't call them. Make sure they know where you are going, and when you expect to be back.
> Stay put and let them come to you.
> Conserve energy, water, and heat—or shade. Keeping cool, calm and collected will help you stay alive. Same in the winter--stay warm! And keep hydrated.
> Bring along a whistle. The sound of a whistle carries much farther than the human voice…and doesn’t require near the effort of yelling. You do know how to whistle, don't you? Seriously, take a plastic whistle on every hike. It weighs nothing, and can save your life.
> Bright clothes that contrast with your environment will help you get found. Bright orange often works, but in the Southwest, you might try baby blue…as Colin Fletcher learned in his book “The Man Who Walked Through Time.” Check out the guy in that yellow jacket below. No way he is going to get lost in the Andes in Peru...