If you do get lost, the first piece of advice is to stay calm. Try to work out where you are, and if possible, attempt to retrace your steps until you find a location you recognize. If you still cannot find your way, check to see if you have phone signal, and if you do, call the authorities. If not, whistle rather than shout for help (if you can). Whistling is more audible to people in the surrounding area and it saves your voice.