In Washington State we essentially use 3 'types' of seaching:
Type I: "Hasty Search" Highly mobile, well equipped and seasoned searchers checking high probability areas... emphasis on speed, assumes a responsive subject.
Type II: "Efficient Search" Usually (but not always) 3 searchers; 1 navigator and 2 flankers "meaningfully wandering," guiding off the navigator covering an assigned area...
Type III: "Grid Search" Used as a last resort; line 'em up, and carefully cover the terrain. Often used as in an evidence search, sometimes hands-and-knees, shoulder-to-shoulder methodical search...
If lost: Stay put. Protect yourself from the environment (clothing, shelter, fire). Signal (whistle, mirror flashes, smoke, etc.)
Support Search and Rescue: Get Lost!!