Is this still the trail?
Why are we going down when we should be climbing?
This direction doesn’t seem right.
Professor Hike has a pretty good article in Backpacker Magazine on how to prevent yourself from getting lost. The professor makes a great point in that the most critical time period is the first five minutes after you begin to question yourself as to whether you're on the right path or not.
He also offers three personal case studies to show what he's talking about. You can click here to read the article.