How to Use a Compass
Learn how to use a compass with this step-by-step beginner's guide. Covers compass parts, finding north, taking and following bearings, reading a map, and adjusting for magnetic declination.
GPS is great until it is not. Batteries die. Signals drop in canyons and dense forests. Phones break when you drop them on a rock. A compass has no batteries and no signal requirements, and the only part that moves is a magnetized needle. It works in rain, snow, and darkness.
The U.S. military still teaches compass navigation as a core skill. Search and rescue teams carry them as primary tools. The reason is that nothing has come along to replace it. Magnetized needles have been guiding travelers for roughly a thousand years, since Chinese navigators first floated them on water around the 11th century. The technology has not fundamentally changed because it did not need to.
The problem is that a compass is rarely taught. It looks straightforward, but the rotating bezel, orienting lines, and declination adjustment are not obvious the first time. This guide breaks it all down. You will learn every part of a compass, how to find north, how to take and follow a bearing, how to navigate with a map, and how to adjust for the difference between magnetic north and true north. By the end, you will be able to navigate confidently without a phone or GPS.
A baseplate compass with a rotating bezel and a direction-of-travel arrow. Suunto, Silva, and Brunton all make reliable models between $10 and $35. Avoid cheap novelty compasses. They are often inaccurate and lack the features covered in this guide. A compass with an adjustable declination screw saves you from doing mental math in the field and is worth the small price bump. A topographic map of a nearby area is helpful for practicing the map skills in this guide. Most national parks sell them at visitor centers for a few dollars, and many are available free from the USGS website.
Learn the parts of your compass
A baseplate compass has about eight parts that matter. The baseplate is the flat, transparent plastic rectangle you hold. It is see-through so you can place it on a map and read features underneath. The magnetic needle sits in the center housing, floating in liquid so it can rotate freely. The red end always points toward magnetic north. The rotating bezel (also called the azimuth ring) is the dial around the needle housing, marked from 0 to 360 degrees. You turn it to set bearings. The direction-of-travel arrow is printed on the baseplate, pointing away from you when you hold the compass. This arrow tells you which way to walk. Inside the bezel housing, you will find the orienting arrow, a large outlined arrow etched into the base of the rotating capsule. When you turn the bezel, this arrow moves with it. The orienting lines are the parallel lines inside the housing that run the same direction as the orienting arrow. You use them to align the compass with a map's grid lines. The index line is the small mark on the baseplate where you read your bearing number. Most compasses also have ruler markings along the edges for measuring distances on a map.
Hold the compass correctly
Hold the compass flat in both hands at chest height with your elbows tucked against your sides. The direction-of-travel arrow should point straight ahead, away from your body. This position keeps the compass level and stable, and it means the direction-of-travel arrow naturally points the same way your body faces. If you tilt the compass, the needle drags against the housing and gives inaccurate readings. If you hold it at waist height and look down, the direction-of-travel arrow points at the ground instead of toward your destination. Chest height, level, arrow forward. That is the only position that works reliably.
Good to know: Keep metal and electronics away from the compass. Phones, belt buckles, trekking poles, and jacket zippers with metal pulls can all deflect the needle. Even 15 to 20 centimeters of distance makes a difference. If your compass is clipped to a metal carabiner on your pack strap, it will read wrong every time.
Find north and orient yourself
Hold the compass flat and let the needle settle. This takes a few seconds. Do not rush it. The red end of the needle points to magnetic north. Now rotate the bezel until the orienting arrow (the outlined arrow inside the housing) lines up directly underneath the red end of the needle. This is called putting red in the shed. The N on the bezel now points the same direction as the needle. Look up from the compass and note what direction north is relative to your surroundings. A distant peak, a tree line, the direction the sun is tracking. Knowing where north is gives you an instant frame of reference. If you know your destination is roughly southwest, you now know the general direction to walk even without taking a precise bearing. This basic orientation check takes ten seconds and it is what everything else in this guide builds on.
Take a bearing on a landmark
A bearing is a direction measured in degrees from north. Due north is 0 (or 360). Due east is 90. Due south is 180. Due west is 270. Everything else falls between. To take a bearing on something you can see, point the direction-of-travel arrow directly at that landmark. A hilltop, a fire tower, a trail junction across a valley. Keep the compass flat and steady at chest height. Without moving the compass, rotate the bezel until the orienting arrow frames the red end of the magnetic needle. Red in the shed again. Now read the number at the index line. That number is your bearing to that landmark. Write it down or remember it. If you need to reach that landmark later, even in fog or darkness, you can follow this bearing back to it.
Good to know: Close one eye when sighting a distant landmark. It is easier to line up the direction-of-travel arrow precisely. For better accuracy, bring the compass up to eye level and sight along the arrow like aiming a camera.
Follow a bearing
You have a bearing, either one you just took or one you calculated from a map. Turn the bezel until that number sits at the index line. Hold the compass flat at chest height. Now rotate your entire body, not just the compass, until the red end of the needle sits inside the orienting arrow. The direction-of-travel arrow now points along your bearing. Pick a visible landmark in that direction. A specific tree, a boulder, a rock outcrop. Something you can walk to without looking at the compass. Put the compass away and walk to that landmark. When you reach it, pull the compass out again, rotate your body until red is in the shed, and pick the next landmark. Repeat until you reach your destination. This leapfrog method keeps you on course far better than walking while staring at the needle, which bounces with every step and leads to drift.
Heads up: The most common beginner mistake is rotating the bezel after setting your bearing. Once your number is at the index line, do not touch the bezel. Only rotate your body. If you bump the bezel accidentally, reset it to your bearing before continuing.
Take a bearing from a map
Place the long edge of the compass baseplate on the map so it connects your current position to your destination. Make sure the direction-of-travel arrow points toward the destination, not backward. This is an easy mistake that sends you exactly 180 degrees the wrong way. Ignore the magnetic needle entirely for this step. You are working with the map, not the field. Rotate the bezel until the orienting lines inside the housing run parallel to the north-south grid lines on the map. The orienting arrow must point toward the top of the map, toward grid north. Read the bearing at the index line. This is your grid bearing. Before you use it in the field, you need to adjust for declination, which the next step covers. The transparent baseplate exists specifically for this task. You can see through it to the map features underneath. Use the ruler markings along the edge to measure distances using the map's scale legend.
Adjust for magnetic declination
True north (where maps point) and magnetic north (where your compass needle points) are not in the same place. The angle between them is called magnetic declination, and it varies by location. In the eastern United States, declination might be 10 to 15 degrees west. In the western United States, it might be 10 to 20 degrees east. This sounds small, but over a few kilometers, ignoring declination can put you hundreds of meters off course. Find your local declination on the NOAA Magnetic Declination website before your trip. If your compass has an adjustable declination screw, set it once and forget it. Insert the small metal key that came with your compass into the screw on the back of the housing. Turn until the declination indicator matches your local value. Every bearing you take from that point is automatically corrected. If your compass lacks this feature, adjust manually. For west declination, add the degrees to your map bearing. For east declination, subtract. The classic mnemonic is west is best (add), east is least (subtract). Check declination for each new area you visit. It changes as you move across the country.
Heads up: Declination values shift over time as the Earth's magnetic field changes. A value printed on an old map may be several degrees off. Always check the current declination for your area online before a trip.
Navigate around obstacles
You are following a bearing and hit something you cannot walk through. A lake, a cliff, dense brush. Do not eyeball a path around it. Use a 90-degree offset. Turn exactly 90 degrees to the right (or left). Count your steps as you walk parallel to the obstacle until you clear it. Turn 90 degrees back to your original bearing and walk past the obstacle. Then turn 90 degrees again, back toward your original line, and walk the same number of steps you counted earlier. You are now back on your original bearing line. This works because the three 90-degree turns create a rectangle that returns you to your original path. The only way it fails is if you lose count of your steps. Pace counting is straightforward. On flat ground a typical adult covers 100 meters in about 60 to 70 double-steps, but walk out your own count over a measured 100 meters before you rely on it. Count every time your left foot hits the ground and you will have a reliable distance estimate.
A compass is one of those skills that feels more complicated than it actually is. The parts have unfamiliar names, the declination concept takes a minute to click, and the first time you try to take a bearing from a map, you will probably line up the orienting arrow backward. That is completely normal. The best way to learn is low-stakes practice. Take a compass and a map to a park you know well. Try navigating between landmarks using only bearings. Walk a triangle: take a bearing, walk 200 steps, turn 120 degrees, walk 200 more, turn 120 again, walk 200 more. If you end up close to where you started, your technique is solid. Once compass navigation clicks, it stays with you. The steps become automatic. You stop thinking about which arrow does what and just read the bearing. And unlike every other navigation tool you own, a compass will never need charging, updating, or a cell signal. It will work the same way it has worked for a thousand years.
Questions we get asked about this
Answers from experience, not a textbook.
A baseplate compass with a rotating bezel, direction-of-travel arrow, and adjustable declination. The Suunto A-10 and Silva Starter 1-2-3 are solid beginner options between $10 and $20. You do not need a mirror sighting compass unless you plan to do serious backcountry navigation where precise bearings over long distances matter. Avoid ball compasses, button compasses, and cheap novelty models. They lack the features covered in this guide and are often inaccurate enough to cause real problems.
A compass works anywhere the Earth's magnetic field is present, which is effectively everywhere. However, compasses are balanced for specific magnetic zones. A compass built for the Northern Hemisphere may not work well near the equator or in the Southern Hemisphere because the needle dips at different angles depending on latitude. If you travel internationally, look for a global needle compass designed to work in all magnetic zones. Near the magnetic poles the needle dips so steeply that readings become unreliable, but this is only an issue in extreme polar regions that very few hikers ever visit.
A phone compass uses a magnetometer chip, which works but has significant limitations. Phone compasses require periodic calibration through a figure-eight waving motion, they are affected by electromagnetic interference from the phone's own components, and they stop working when your battery dies. For a day hike on a well-marked trail, a phone compass is fine as a convenience tool. For backcountry navigation where getting lost has real consequences, carry a real compass. Many experienced hikers carry both. A dedicated compass weighs almost nothing and costs less than a single meal out.
Hold it flat and let the needle settle. It should point consistently toward magnetic north without sticking, spinning aimlessly, or wobbling endlessly. If you have a second compass, hold them side by side. Both needles should agree within a degree or two. A needle that points in random directions or refuses to settle has likely lost its magnetism. This can happen if you store the compass next to strong magnets, speakers, or electronics for long periods. Quality compasses from reputable brands rarely have this problem within a normal lifespan of 10 to 20 years.
No. A compass alone tells you direction. You can find north, follow a bearing, and retrace your route without any map at all. But adding a topographic map dramatically expands what you can do. You can plan routes in advance, identify terrain features, triangulate your position using two or more landmarks, and estimate distances. For serious backcountry navigation, use both. For simpler situations like walking a straight line to a road, a river, or a shoreline you know is to the west, a compass alone works fine.
A bearing is the direction from one point to another, measured in degrees from north. A heading is the direction you are currently facing. They are the same when you face directly toward your destination. If you detour around an obstacle, your heading changes temporarily but your intended bearing stays the same. When you clear the obstacle and turn back, you resume walking on the original bearing. Think of a bearing as the direction you want to go and a heading as the direction you are actually pointed right now.