# How to Read a Compass: Bearings, Declination, and True North

- Published: Jul 16, 2026
- Source (HTML): https://foreignerguide.com/articles/how-to-read-a-compass-bearings-declination-and-true-north.html
- Published by: [Foreigner Guide](https://foreignerguide.com/)

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> How to read a baseplate compass: its parts, taking a bearing, and correcting for magnetic declination so your needle matches true north on the map.

A compass needle points to magnetic north. To read one, you hold it flat, let the needle settle, and read the direction off the numbered dial. The step most people miss is correcting for declination, the gap between where the needle points and true north on a map. Get that gap right and a basic baseplate compass will keep you oriented when your phone dies or loses signal. The National Oceanic and Atmospheric Administration (NOAA), which publishes the official model of Earth's magnetic field, defines declination as the angle between magnetic north and true north.

This guide covers a standard baseplate (or 'orienteering') compass, the clear plastic kind hikers and travelers carry, rather than marine or military lensatic models, which read a little differently. It is general navigation guidance, not a replacement for a local guide or a marked route. As of July 2026, NOAA's current World Magnetic Model, WMM2025, is valid through 2029, so any declination figure you look up now will drift slightly over the next few years.

## What the parts of a compass do

Reading a compass gets easier once you know the five parts you actually touch. A baseplate compass has a clear plastic base you can see a map through, a rotating ring of numbers, and a magnetic needle floating in liquid.

| Part | What it does |
| --- | --- |
| Baseplate | Clear base with a straight edge for lining up on a map |
| Direction-of-travel arrow | Fixed arrow on the base; you point it where you want to go |
| Rotating bezel | Outer dial marked 0 to 360 degrees that you twist by hand |
| Magnetic needle | Floats freely; the red or glowing end points to magnetic north |
| Orienting arrow | Outline inside the bezel, the 'shed' where you park the red needle |

The dial is marked in degrees as well as letters. North is 0 (and 360), east is 90, south is 180, and west is 270. A reading of 45 degrees is northeast; 135 degrees is southeast. The numbers matter because a heading such as 'bearing 072' is exact, while 'head sort of east' is a guess.

## How do you read a compass direction?

Hold the compass flat in your palm at waist height, point the direction-of-travel arrow straight ahead, and turn the bezel until the red end of the needle sits inside the orienting arrow. Then read the number lined up with the direction-of-travel arrow. That number is your bearing.

Walkers remember the final step with a rhyme: 'red in the shed'. The red needle is the object, the orienting arrow outline is the shed, and when they overlap the compass and the ground agree on where north is.

To follow a bearing toward a landmark, the Swedish compass maker Silva describes a three-step routine it calls the '1-2-3 System':

- Set the bearing: turn the bezel so your chosen number lines up with the direction-of-travel arrow.
- Turn your body: rotate yourself, compass and all, until red is in the shed.
- Walk the arrow: the direction-of-travel arrow now points at your destination, so pick a tree or rock on that line, walk to it, and repeat.

## What is magnetic declination, and do you correct for it?

In most places, yes. Your needle points to magnetic north, but the north printed on your map is true north, the actual top of the globe. Declination is the angle between the two. NOAA's National Centers for Environmental Information counts declination as positive when magnetic north sits east of true north and negative when it sits west.

The size of that angle depends on where you stand, and it drifts over the years as the magnetic pole moves. The U.S. Geological Survey has noted that the magnetic pole lies roughly 1,200 miles from the geographic North Pole, so the two rarely line up. That movement is why NOAA reissues its [World Magnetic Model](https://www.ncei.noaa.gov/products/world-magnetic-model) on a schedule: the current version, WMM2025, was released on 17 December 2024 and runs through 2029. To get the figure for one exact spot, NOAA runs a free online declination calculator where you type in a latitude and longitude; the [U.S. Geological Survey](https://www.usgs.gov) explains the same map-versus-compass gap in plain terms.

Correcting is simple arithmetic once you have the number. If your declination is 10 degrees east, a magnetic bearing of 100 becomes a true bearing of 110, because you add an east value and subtract a west one. Many baseplate compasses remove the math with a small declination screw: set it once for your region and the compass adjusts every reading.

## Reading a compass when you travel abroad

A compass earns its spot in a travel pack for one plain reason: it needs no battery, no signal, and no data plan. Hike a trail in an unfamiliar country and the signs may be in a language you do not read, the phone may show one bar, and the offline map may never have downloaded. The needle still swings to north.

Two habits help once you cross a border. First, set your declination for the destination rather than for home, since the figure in the Alps differs from the figure in the Rocky Mountains, and NOAA's calculator accepts any coordinates on Earth. Second, treat the compass as the backup that never quits and the phone as the convenience, because batteries drain and cold weather drains them faster. If you are still building your kit, our rundown of [boots, gear, and trail safety for hiking abroad](https://foreignerguide.com/articles/hiking-abroad-boots-gear-and-trail-safety-basics.html) covers what else belongs in the pack.

## A field check before you trust the needle

Run three checks before you rely on a reading. Keep metal and electronics clear of the needle, because a phone, a knife, or a nearby car door can pull it off by several degrees. Hold the compass level so the needle floats free instead of dragging on the capsule. And confirm the red end, not the white end, is the one sitting in the shed, since reading it backward puts you 180 degrees wrong, the most common beginner mistake. Practice in a park where you already know which way north is, and the skill will be ready when the trail is not marked.

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