Quick choice: use the sky you actually have
- Clear night in the Northern Hemisphere: use Polaris for approximate true north.
- Visible moving shadow and level ground: mark two shadow tips for an approximate east-west line.
- Visible sun, an analogue watch and US mid-latitudes: use the watch only as a rough cross-check.
- Overcast, obstructed sky or conflicting results: do not manufacture a heading from moss, trees, wind or a single landmark. Return to location, signaling and shelter decisions.
Method 1: find north from Polaris
- Find the Big Dipper on a clear night. It is a seven-star pattern, not the whole constellation Ursa Major.
- Use the two stars at the outer edge of the Dipper’s bowl as pointers. Follow their line away from the bottom of the bowl about five pointer-star spacings.
- The star reached is Polaris, at the end of the Little Dipper’s handle. It is not the brightest star in the sky.
- Face Polaris, then project a line straight down to the horizon. That is approximate true north.
NASA’s illustrated Polaris guide confirms the pointer-star method and explains why Polaris stays near the north celestial pole. It is a Northern Hemisphere method. Trees, terrain, haze and light pollution may hide the relevant stars, and identifying the wrong star creates a wrong heading. Confirm the result with a map, known landmark or another independent cue before using it.
Method 2: mark a moving shadow
- Choose open, level ground where the shadow tip is sharp. Set a straight stick as vertical as practical.
- Mark the exact tip of its shadow with a stone or scratch.
- Wait 20 to 30 minutes without moving the stick. Mark the new shadow tip.
- Draw a line from the first mark to the second. Under ordinary conditions the moving tip gives an approximate west-to-east line: first mark west, second mark east.
- Stand with west on your left and east on your right to face approximate north.
This is a rough field construction, not a surveyed bearing. A leaning stick, sloped ground, a fuzzy shadow or too short a wait increases error. The sun’s path also curves, so the two-point line is approximate. National Geographic’s compass explanation describes using a shadow stick to determine east and west. Repeat the test or compare it with a known feature rather than assigning it false precision.
Method 3: use an analogue watch as a rough check
For the Northern Hemisphere at ordinary US latitudes, set the watch to local standard time, hold it level and point the hour hand toward the sun. The direction halfway along the smaller angle between the hour hand and 12 o’clock is approximately south; the opposite direction is approximately north. If the watch shows daylight-saving time, mentally subtract one hour first.
The watch method is vulnerable to time-zone offset, daylight-saving error, latitude, season and choosing the wrong angle. It becomes especially awkward near noon and is not dependable near the equator. Never stare at the sun: align the hand from the direction of a small object’s shadow instead. Treat this as a quick cross-check, not the basis for off-trail travel.
Cross-check before trusting a heading
A result becomes more useful when two independent observations agree. Compare Polaris with a mapped road orientation, or a shadow line with a known trail or landmark. If the cues disagree, stop and diagnose the mismatch; do not average two guesses. Check that you identified the correct star, used level ground, allowed the shadow to move and accounted for standard time.
Natural patterns are not independent bearings. Moss grows where local shade and moisture favor it. Vegetation differs with slope, water, wind, soil and disturbance. The Moon changes position and phase. None is a reliable north arrow by itself.
Also separate a heading from a route. North is only a direction. A route requires a known starting point, a destination, passable terrain and a way to monitor progress. Walking north because a road is believed to be north can make the emergency worse when the road’s position, distance or intervening hazards are uncertain. A phone showing coordinates can still be valuable even when its map tiles or data connection fail: relay the coordinates to rescuers and conserve the battery. Do not spend that limited power repeatedly checking a magnetic compass app beside metal, magnets or electronics.
True north, magnetic north and your map
Polaris and sun methods estimate geographic or true direction. A magnetic compass responds to Earth’s magnetic field. The angle between magnetic north and true north is magnetic declination; it varies by location and changes over time. USGS explains declination and why an old map value may no longer be current.
A compass is most useful with a current map and practiced technique, not as a magic arrow toward safety. Our survival compass guide explains equipment choices; practice with the exact compass and map before a trip. The NPS Ten Essentials guidance recommends map, compass and GPS, including a physical map and spare phone power.
Hold a straight line only after choosing a safe destination
If you already know that a visible destination or mapped handrail is safe, choose a distinct feature on your heading and walk to it. Before detouring around an obstacle, note a back landmark on the same line. After the detour, realign the back landmark with the next forward feature. Repeat in short legs.
This technique reduces unnoticed curves; it does not validate the destination. Stop before terrain you cannot assess, water crossings, cliffs, wildfire, darkness or worsening weather. Night movement adds fall and route-finding risk. Waiting for visibility may be safer than preserving a guessed course.
A 20-minute practice card
- Plan: in a familiar open place, mark true north from a map or a reliable calibrated device. Keep that answer hidden at first.
- Shadow: make a two-mark shadow line and record the time, wait and ground conditions.
- Sky: on a separate clear evening, find the Big Dipper and Polaris with NASA’s diagram.
- Compare: check each result against the known direction. Record which step created the biggest error.
- Repeat: practice again in another season and teach a companion the stop-locate-signal decision before the technique.
For an actual outing, leave a route and return time with somebody, carry the navigation tools appropriate to the terrain and download the map before losing service. Our broader survival-skills practice plan can help schedule low-risk repetitions.
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