In flat, featureless terrain, and I include flat forested areas, along with periods of decreased visibility, such as sand storms or blizzards (or nighttime), a compass or GPS, and a map are pretty important. Azimuth and distance can get you through these types of areas and situations. Most people will choose not to move at night or in blizzards or sad storms, but a very foggy day can last a while and disrupt a good hiking plan. Good planning of your route can ensure you do not get lost, if you have to move.