Why should I learn to use a compass?
With the advent of GPS, navigating by compass has become something of a lost art. It’s easy to see why: In clear skies, modern GPS receivers can determine a user’s location accurately and quickly with little to no user skill necessary.
But here’s the thing: GPS units are electronic, and electronics fail at the most inopportune times. Sometimes, they run out of battery; sometimes, after years of use, they fail. Furthermore, they can usually only tell which way you’re facing once you’re on the move.
Compasses, on the other hand, are nigh-indestructible. They don’t take batteries, don’t have screens to break, and don’t need software updates. When protected with either waterproof coatings or careful storage, maps rarely fail. Keeping these two simple items in your pack—and knowing how to use them—is a small step that could save you a lot of trouble.
Get to Know Your Compass
A compass is the most reliable navigation method—but it’s no good unless you know your way around it. Which parts your compass has depends largely on what kind you carry. Here are some common components.
Parts of a compass
Baseplate: a clear back that lets you see the map underneath. The ruled edge helps with triangulation and taking your bearings.
Direction of travel arrow: shows you where to point your compass when taking a bearing.
Index line: an extension of the direction of travel arrow that indicates where to read bearings
Rotating bezel: circular area marked with number degrees from (clockwise) 0 to 360.
Magnetized needle: located inside of the bezel, it always points to magnetic north, not true north. (They’re hundreds of miles apart.)
Orienting arrow: helps line the bezel up with the directions on the map
Declination scale: hash marks on the inside of the bezel, designed to help adjust declination.
Correcting for Declination
One of the tricky parts of navigating with a compass is that magnetic north isn’t the same as true north. The angle between the two—known as the declination—varies depending on your location. It also gradually changes over time as the Earth’s tectonic plates shift. If you don’t adjust your compass to compensate, you’ll find yourself headed in the wrong direction
The easiest way to find the angle of declination is to check your map: most have declination diagrams, along with the date it was last revised. Because declination changes over time, newer maps will have more accurate figures. There should be an angle and a direction—for example, 8 degrees east.
Working off an older map? Check online. There are several different services that can use the location you’ll be hiking in to calculate your declination.
Once you have your declination, subtract it from your compass bearing for west and add it for east. If you have trouble remembering that rule, try this mnemonic: Maps Tell Almost Everything. (Translation: Magnetic to True: Add East.)
How to Find Your Location with a Compass
Figuring out your location with a map and compass is easy, but it comes with some caveats. First, you’ll need to be able to find at least two known landmarks. (Mountains and lakes are both good choices.) If you can find a third, even better. As always, remember to adjust for declination
1. Using your compass, orient your map so that north is pointing to true north. (Pro tip: make sure the fixed grid lines on your compass line up with the north-south grid lines on your map.)
2. Take a bearing on your first landmark: Line up your direction of travel arrow with your landmark, then rotate the bezel until the needle lines up with the markings for north. (The number next to the index line is your bearing).
3. On the map, place one corner of your compass’s straightedge on the landmark, the rotate the entire compass until the needle lines up with north on the bezel. Using a pencil, draw a line across the edge.
4. Repeat steps 2 and 3 for your other landmarks. The point where all the lines intersect is your approximate location.
How to Find Your Bearings With a Compass
If you already know your location, you can use your compass to figure out how to get to any point on your map. After adjusting your compass for declination, start by orienting your map to true north, as in the previous example.
1. Place the corner of your compass’s baseplate on your location, then rotate your entire compass until the straightedge forms a line between your location and your destination.
2. Rotate the bezel until the grid lines on the base plate match the grid lines on the map.
3. Read the number next to the index line—this is your bearing.
4. Holding the compass level in front of you, turn your body until the north arrow on the bezel matches up with the compass’s needle. Your direction of travel arrow should now be pointing towards your destination.
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