Getting from here to there is usually just a matter of keeping an eye on the landscape and watching were you're going, helped by an occasional glance at the map. However, if the current objective is out of sight, you can take compass in hand, set a bearing, and follow the direction-of-travel line as it guides you to the goal. This is navigation by instrument. Sometimes this is the only practical method for finding the pass or base camp or whatever. It also serves as a supplement to other methods and a way of verifying that you're on the right track. Again, use common sense and challenge a compass bearing that defies reason. (Is your declination arrow pointing the wrong way, sending you 180 degrees off course?)

Continue reading here: Map And Compass

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