WHAT ARE YOUR OPTIONS?
You have three main choices:
A dedicated PLB (Personal Locator Beacon)
A satellite messenger with added rescue facilities (DeLorme or Spot)
Conventional measures such as a whistle, strobe light, mirror or flare.
For any non-trivial situation, I believe the PLB is unambiguously your best option if rescue is your top priority.
You can build a so called "smoke generator" and feed it with certain material to specifically generate white smoke. It's basically a survival technique.
First, make a platform from dead wood, and stack it as shown in the illustration.
Stack the wood 4 or 5 high, and make it fairly large, perhaps 4 feet
in length. Then cover it with evergreen boughs, ...
It is generally a good idea to carry some sort of emergency signaling equipment if you go into the wilderness.
Whistle : has limited range but is especially useful if you get separated from your party in fog or snow or if it is likely the peopel will be searching for you on foot. Internationally recognised distress signals are SOS in morse code (... --- ......
See the question and answers in What order of response time can I expect if I hit the "911" button on my SPOT Satellite Personal Tracker?
We've scorned such wimpy behavior (carrying a satellite personal tracker) for years, until a good friend gave us one, and insisted that we carry it. We've never had to use the emergency feature, but after each ...