How to Find True North

Did you know that most compasses don't point directly to the North Pole? Instead, they typically point toward magnetic north, which is located in the Arctic region, close to—but not identical to—the North Pole. While this small difference is generally overlooked in casual situations, it can pose significant issues when navigating in the wild. Fortunately, there are multiple methods to locate true north (the direction of the North Pole) using tools ranging from modern technology to the sun, moon, and stars.

Obtain your local declination data from the NGDC. One of the challenges with distinguishing true north from magnetic north is that compasses are affected by magnetic declination, a phenomenon in which the magnetic field of the Earth changes over time, causing variations in compass readings. To properly adjust your compass for this effect, you need the most up-to-date declination value for your location.

• The National Geophysical Data Center (NGDC) offers current global declination data. You can visit their website to input your location and find the latest declination value specific to your area.

Alternatively, determine your declination using a map. Certain physical maps will display declination values for the regions they cover. Topographic maps are more likely to include this data, though it can sometimes be found in other map types as well. If you plan to navigate with a map and compass, it's a good idea to consult the map’s legend to verify whether it contains accurate declination values.

• Remember, declination shifts over time, so older maps may become inaccurate. For the most precise information, use the most recently published map available.

Identify magnetic north with your compass. Once you're aware of the discrepancy between magnetic north and true north, adjusting your compass is straightforward. Begin by locating magnetic north. Hold your compass flat and level in front of you. If the compass has a travel arrow (a narrow red arrow at the bottom of the compass), point it forward. Observe the movement of the compass needle. Once it stabilizes, note where the needle points. This will be the north-south axis.

• Modern compasses typically feature a needle that is half red and half white. The red end of the needle points to the north.

Rotate the orienting arrow to face forward. When navigating with a compass, adjust the bezel so that the direction you intend to travel is aligned directly in front of you, in line with the travel arrow. In this case, since we want to find north, rotate the bezel until the "N" (and the wide arrow beneath it) is facing forward.

• Bear in mind that this represents magnetic north, not true north — we still need to adjust for declination.

Adjust for declination. Turn your body until the compass needle aligns with the orienting arrow on the bezel (and, consequently, the travel arrow as well). Now you are facing magnetic north. To find true north, rotate the bezel by the same magnitude and direction as your declination value. Most compasses have degree markers on the bezel to aid in this process. Next, realign the needle with the orienting arrow by turning your body once more. You should now be facing true north!

• For example, if the declination value for your area is 14^o E, while facing magnetic north, you would rotate the bezel 14^o to the east (clockwise). Then, turn to the left (west) to align the needle with the orienting arrow, placing you facing true north (14^o west of magnetic north).

Use the movement of the sun. Even without a compass, you can still determine true north by observing the sun's path. The sun rises in the East and sets in the West, which provides a simple way to estimate north. Just after sunrise, keep the sun on your right to face north — and just before sunset, keep the sun on your left. Around noon, the sun will be directly south, so simply face away from it to find north.

• A more precise method involves using a stick as a rudimentary sundial. Place a stick or pole a few feet tall in the ground and mark where the shadow ends. After 15 minutes, mark its new position. Stand with your left foot on the first mark and your right on the second. You should now be facing true north, regardless of local declination.

Use an analog watch. A clever way to find true north involves using the hour hand of a non-digital watch. Begin by holding your watch with the hour hand pointing forward. Rotate your body so that the hour hand faces the sun. Then, find the midpoint between the hour hand and the 12 o'clock mark on the watch — this will point along the north-south axis.

• For example, if it’s 4:00 PM, the midpoint between 4:00 and 12:00 is 2:00. Point the hour hand at the sun, and the north-south line will be slightly to your left. Since the sun is setting in the west, north will be behind you as you face toward the 2:00 marker.
• Remember to adjust for Daylight Savings Time! If your watch is set to DST, use the 1:00 mark instead of 12:00 and proceed as usual.

Look for natural indicators. Various plants and trees can provide hints about the direction of north. While these signs can be helpful, they are often unreliable, so you should rely on them only when other methods aren’t available. Here are a few clues to watch for:

• Moss: It may grow thicker on the south side of trees, where there’s more sunlight.
• Trees: The bark on the north side might appear duller, and branches may grow taller due to reduced sunlight.
• Ants: Ant hills may be more common on the southern sides of natural features where it’s warmer from the sun.
• Snow: Snow tends to melt quicker on the southern sides of trees and rocks, which receive more sunlight.

Use Polaris, the North Star. Navigating at night becomes much easier once you find Polaris, the North Star, which aligns closely with the Earth’s North Pole. If you can locate this star, you’ll know exactly where true north lies. The simplest way to find Polaris is by using the Big Dipper constellation — the two stars at the end of the "spoon" point straight to Polaris.

• However, keep in mind that Polaris is not visible from the Southern Hemisphere, so it’s only useful for navigation north of the equator.

Use the moon. Just like the sun, the moon travels across the sky from east to west. This predictable movement allows you to use the moon to help you find true north during the night. Early in the evening, position the moon to your right to face north, and as the night progresses, keep it to your left. At its peak, the moon will be roughly in the southern part of the sky, so by facing away from it, you will be facing north.

• If the moon appears as a crescent, imagine drawing a line through its horns towards the horizon — this will point to the south. Then, turning away from this direction, you will face north. This method works best when the moon is high in the sky.

Use the motion of the sun. In the Southern Hemisphere, the sun's light strikes at a different angle than in the Northern Hemisphere, so the method for determining north is a little altered. The sun still rises in the east and sets in the west, but at noon, it will be directly north instead of south as it is in the Northern Hemisphere.

• This means that while you’ll still face the sun’s right side after sunrise and its left side after sunset to face north, at noon, you’ll need to face the sun to determine north.

Use an analog watch. Since the sun follows a northern arc in the Southern Hemisphere, finding north using an analog watch involves an inverted method compared to the Northern Hemisphere. Point the 12:00 position on your watch toward the sun and locate the halfway point between the 12:00 and your hour hand. This midpoint indicates the north-south line.

• For instance, if it's 6:00 PM, the midpoint will be between 3:00 and 9:00. As it’s evening, the sun will be in the western half of the sky. By aligning the 12:00 mark with the sun, the 3:00 mark will roughly point to true north.

Use the Southern Cross at night. Unlike the Northern Hemisphere, where Polaris serves as a reliable guide, the Southern Hemisphere does not have a comparable pole star. However, you can use the Southern Cross constellation, which rotates closely around the south celestial pole. To find due south, locate the Southern Cross and extend an imaginary line straight down to the horizon. This line will point to south, and by turning 180 degrees, you’ll be facing north.

• The easiest way to find the Southern Cross is by using the Pointers — two bright stars that point directly at it. The Pointers are part of the Milky Way, which is often visible from areas with minimal light pollution.

Use the moon. In the Southern Hemisphere, the moon still moves across the sky from east to west, just like the sun. However, when it reaches its highest point, it points toward the north, not the south. This shift means that when using a crescent moon for navigation, the directions are flipped — the line you draw through the horns of the crescent to the horizon will indicate north, not south as it would in the Northern Hemisphere.