A compass is one of the oldest and most reliable navigation tools ever made. Unlike a phone GPS, it has no battery to die, no signal to lose, and no screen to crack. Whether you’re hiking in the backcountry, orienteering, or simply trying to figure out which direction your street runs, knowing how to read a compass is a skill that stays with you for life.
This guide covers everything a beginner needs — from the parts of a compass to taking and following a bearing in the field.
The Parts of a Compass
A standard baseplate compass (the kind used in hiking and orienteering) has a few key components:
- Magnetic needle — the heart of the compass. One end (usually red) always seeks magnetic north. The other end (usually white or black) points south.
- Compass housing (bezel) — the rotating circular dial marked with degrees from 0° to 360° and the cardinal letters N, E, S, W.
- Orienting arrow — a fixed arrow inside the housing that you align with the needle during use.
- Direction of travel arrow — printed on the baseplate, pointing toward the top of the compass. This is the direction you walk.
- Baseplate — the flat transparent platform the housing sits on, usually with rulers along the edges for map work.
On a digital compass like the one on this site, the rotating dial replaces the bezel, and the red needle is rendered on screen — but the fundamental information is identical.
Cardinal and Intercardinal Directions
The compass rose is divided into 360°, starting at North (0°/360°) and going clockwise:
| Direction | Degrees |
|---|---|
| North (N) | 0° / 360° |
| Northeast (NE) | 45° |
| East (E) | 90° |
| Southeast (SE) | 135° |
| South (S) | 180° |
| Southwest (SW) | 225° |
| West (W) | 270° |
| Northwest (NW) | 315° |
The four cardinal directions (N, E, S, W) and four intercardinal directions (NE, SE, SW, NW) divide the compass into eight equal segments of 45°. More precise navigation uses the full 360° scale — a bearing of 047° means 47° clockwise from north, which is just slightly north of northeast.
Magnetic North vs. True North
This is the most important concept beginners miss. The compass needle does not point to the geographic North Pole. It points to magnetic north — a point in the Canadian Arctic where Earth’s magnetic field lines converge. The difference between magnetic north and true (geographic) north is called magnetic declination.
Declination varies by location:
- In western Europe: roughly 0–5° (small, often ignorable)
- On the US east coast: about 10–14° west
- On the US west coast: about 13–16° east
- In Alaska: up to 20° east
For short hikes in areas of low declination, you can ignore it. For any serious navigation — especially over long distances or with a map — you need to account for it. Use our Star Compass to see your exact local declination.
How to Hold a Compass Correctly
Hold the compass level and flat in front of you, roughly at waist height. Keep it away from your phone, belt buckle, car keys, and any metal objects — these create magnetic interference that can deflect the needle by several degrees.
Rotate your body (not just the compass) until the red magnetic needle aligns with the orienting arrow inside the housing. Now the compass rose is oriented to the real world — north on the dial matches north in front of you.
How to Take a Bearing to a Landmark
A bearing is the angle between north and the direction to a specific point, measured clockwise in degrees. Here’s how to take one:
- Point the direction of travel arrow at your target (a mountain peak, a building, a trail junction).
- Hold the compass level and steady while you rotate the housing until the orienting arrow aligns with the red needle (“red in the shed”).
- Read the number at the index line (where the direction of travel arrow meets the housing). That’s your bearing.
If the bearing reads 245°, your target is 245° clockwise from magnetic north — roughly southwest.
How to Follow a Bearing
Once you have a bearing, following it means walking in that direction consistently:
- Set the bearing on your compass by rotating the housing until that number aligns with the index line.
- Hold the compass level and rotate your entire body until “red is in the shed” — the needle aligns with the orienting arrow.
- Look up and identify a distant landmark directly in line with the direction of travel arrow. Walk to that landmark.
- Repeat the process from each new position. This “aiming off” technique keeps you on bearing without staring at the compass with every step.
Tips for Accurate Compass Use
Avoid metal interference. Test your compass by turning it in different directions — the needle should settle smoothly back to north. If it sticks, jumps, or points somewhere odd, you’re near a magnetic interference source. Walk a few metres away and try again.
Keep it horizontal. A tilted compass causes the needle to drag against the housing, reducing accuracy. Some compass needles will even stop moving if the compass is held vertically.
Check your back bearing. After walking a bearing, occasionally turn around and check that the landmark you came from is at bearing + 180°. If it’s off significantly, you’ve drifted.
In an online compass like the one on this site, the same principles apply — the dial rotates so north always points to actual north, and the degree readout shows your current heading. To follow a bearing, simply face the direction until the dial shows the bearing you want.
Summary
Reading a compass comes down to three fundamentals: understanding that the red needle always seeks magnetic north, knowing the 360° degree system, and being able to translate a bearing into a real-world direction. With a little practice taking bearings to landmarks and walking them out, the compass becomes second nature — a reliable partner for any adventure where maps and GPS alone aren’t enough.