An inert individual is rather hard to find - that is why there is all the emphasis on proactive signalling for those in difficulty. This is even more so if you are prone and surrounded by vegetation or under trees, wearing dull pastel colors. You may be there a very long time.

Some years ago we were involved in a search at Organ Pipe National Monument for a lost hiker. The country was very rough - vertical cliffs, deep canyons, and rotten rock. People in the field thought they could smell the body (it's a very distinctive smell) but the body AFAIK has never been recovered...