Five reliable ways to find north without a compass

Every method here uses the sky, which cannot be disturbed by a magnet, a steel beam, or a flat battery. None of them are as fast as a compass, and only one is as precise, but any of them will keep you walking in the right general direction.

The sun compass calculates a current celestial bearing from your location and time. For a sensor-based comparison, read how to use a compass.

1. The shadow stick, accurate to a few degrees

The most reliable daytime method, and the only one on this list that works anywhere on Earth in any season.

1. Push a straight stick, about a metre long, upright into level ground.
2. Mark the tip of its shadow with a pebble.
3. Wait fifteen to twenty minutes, longer if you can, then mark the new shadow tip.
4. Draw a line between the two marks. That line runs approximately west to east, with the first mark on the west end.
5. Stand with the first mark under your left foot and the second under your right. You are now facing roughly north in the northern hemisphere, south in the southern.

Accuracy is best in the middle of the day and degrades near sunrise and sunset. A two-hour interval instead of twenty minutes gets you within a couple of degrees.

2. The analogue watch method, accurate to about 15°

Only worth using when you need a direction immediately and only in the middle latitudes.

Northern hemisphere: hold the watch flat and point the hour hand at the sun. The direction halfway between the hour hand and twelve o'clock is south.

Southern hemisphere: point twelve o'clock at the sun instead. Halfway between twelve and the hour hand is north.

Two catches. Subtract an hour first if daylight saving is in force. And the method assumes solar noon coincides with clock noon, which is rarely true. Time zones are wide, and at the western edge of a zone the sun can be over an hour behind the clock. Expect errors of ten to twenty degrees, more in the tropics, where the method degenerates completely because the sun passes nearly overhead.

3. Polaris, accurate to under 1° in the northern hemisphere

The North Star sits almost exactly above the geographic North Pole, which makes it the most accurate natural reference available. It is not especially bright, so find it by pattern rather than brightness.

1. Find the Plough (Big Dipper): seven stars, four in a bowl, three in a handle.
2. Take the two stars at the outer edge of the bowl, furthest from the handle. These are the pointers.
3. Follow the line they make out of the bowl, and extend it about five times the gap between them. The moderately bright star you land on is Polaris.
4. Drop straight down to the horizon. That point is true north.

Bonus: the angle of Polaris above the horizon equals your latitude, to within a degree.

4. The Southern Cross, accurate to a few degrees

There is no southern pole star, so the south celestial pole has to be constructed.

1. Find Crux, the Southern Cross, a compact four-star cross. Do not confuse it with the larger, fainter “False Cross” nearby.
2. Extend the long axis of the cross, from the top star through the bottom star, by about four and a half times its own length.
3. Drop from that point to the horizon. That is south. The two bright Pointers, Alpha and Beta Centauri, sit off to one side and confirm you have the right cross.

5. The crescent moon, rough but instant

Draw an imaginary line through the two horns of a crescent moon and extend it down to the horizon. In the northern hemisphere that point is roughly south; in the southern hemisphere, roughly north. Expect errors of twenty or thirty degrees. It is a “which way is broadly south” tool, not a navigation method.

Methods worth ignoring

Moss does not reliably grow on the north side of trees. It grows where it is damp and shaded, which depends on prevailing wind, slope, and canopy far more than on direction. Tree rings, branch density, and snow melt patterns are similarly unreliable. They are folklore, not navigation.

The modern shortcut

If your device has a clock and knows where it is, the sun's exact bearing can be computed from first principles, with no magnetometer and no waiting for shadows to move. Point the top of your phone at the sun, read the computed bearing, and you have a true-north reference. The result still depends on the accuracy of your location, clock, and physical alignment with the sun. That is what the sun compass on this site calculates when a magnetic compass cannot be trusted.

Open the sun compass to calculate the sun's bearing for your location before checking it against the sky.