While the term SOS is believed by many to stand for "save our ship," that's not actually the case. It was really chosen simply because the way the distress signal is sent when using Morse code -- three dots, three dashes and three more dots -- was hard to confuse with anything else. Unfortunately, if you're stranded, you most likely won't have a two-way radio, but if you do, it's probably equipped with a means to send signal beeps. If so, use the Morse code version to try and send out a rescue SOS. If you're stuck without a radio, find a large open space and do it the old fashioned way, by spelling it out with tree branches or rocks. The good thing about this kind of rescue signal is that it doesn't need to be managed. Once you have it built, you can walk away and concentrate on that signal fire.