The most common situation requiring instrument navigation comes when the route is unclear position. That can be a big help, though. Climbers in the general vicinity of Fantastic River then know they are near where the bearing line plotted from the one feature intersects the river. Perhaps from a study of the map they can then figure out just where they are. They can also read the altimeter and see on the map where the bearing line intersects the contour line for that elevation. The closer an angle of intersection is to 90 degrees, the more accurate the point position will be.
Use every scrap of information at your disposal, but be sure your conclusions agree with common sense. If the climbers who took bearings on Mount Majestic and Unsavory Spire find that the two lines on the map intersect in the river, but the climbers are on a high point of land, something is wrong. Try again. Try to take a bearing on another landmark, and plot it. If lines intersect at a map location with no similarity to the terrain, there might be some magnetic anomaly in the rocks, or you may have an inaccurate map. And who knows? Maybe those peaks weren't really Majestic and Unsavory in the first place.
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