How to Pick North South Heads

Understanding how to pick north south heads is a foundational skill in navigation, surveying, engineering, and outdoor exploration. Whether you're an orienteering enthusiast, a civil engineer planning infrastructure, a geologist mapping terrain, or a hiker relying on a compass in remote areas, correctly identifying north and south headings ensures accuracy, safety, and efficiency. Despite the prevalence of GPS technology, manual methods of determining direction remain vitalespecially when electronic devices fail, batteries die, or signals are lost in dense forests, canyons, or polar regions.

The term north south heads refers to the directional alignment along the north-south axisthe imaginary line running from the Earths North Pole to its South Pole. Picking these heads means accurately establishing which direction is true north and which is true south using available tools, environmental cues, or celestial references. This is not merely about pointing a compass; its about understanding magnetic variation, terrain influence, and the difference between magnetic and geographic north. Mastering this skill transforms ambiguity into precision.

In this comprehensive guide, well walk you through the science, techniques, tools, and real-world applications of picking north south heads. Youll learn step-by-step methods to determine direction with or without technology, avoid common pitfalls, and apply best practices in diverse environments. By the end, youll not only know how to pick north south headsyoull understand why it matters and how to do it reliably under any condition.

Step-by-Step Guide

Step 1: Understand the Difference Between Magnetic and True North

Before you begin picking north south heads, you must distinguish between magnetic north and true (geographic) north. Magnetic north is the direction a compass needle points towardthe location of Earths magnetic fields southern pole, currently situated in northern Canada. True north, however, is the direction toward the geographic North Pole, the fixed point where Earths axis of rotation meets its surface.

The angular difference between these two points is called magnetic declination. This value varies by location and changes over time due to shifts in Earths magnetic field. In the United States, declination can range from 20 degrees east in Maine to 15 degrees west in Washington. Ignoring declination leads to significant navigation errorsespecially over long distances.

To begin picking north south heads accurately, always determine your local magnetic declination. You can find this data on topographic maps, through the National Oceanic and Atmospheric Administration (NOAA) website, or via mobile apps like Gaia GPS or Compass Pro. Record this value before proceeding.

Step 2: Choose Your Method of Direction Finding

There are multiple ways to pick north south heads, each suited to different conditions. The most common methods include:

• Using a magnetic compass
• Using the sun and shadows
• Using the stars (Polaris in the Northern Hemisphere)
• Using digital tools (GPS, smartphone apps)

Each method has strengths and limitations. For example, compasses are reliable in cloudy weather but affected by local magnetic interference. The sun method works during daylight but requires clear skies and precise timing. Stars are ideal at night but only visible under clear conditions. Digital tools are fast and accurate but dependent on power and signal.

Always have a backup method. Relying on a single technique increases risk. For critical applicationssuch as wilderness survival or land surveyinglearn at least two reliable methods.

Step 3: Using a Magnetic Compass to Pick North South Heads

A magnetic compass is the most widely used tool for determining direction. Heres how to use it correctly:

1. Hold the compass level. Tilt can cause the needle to drag against the housing, giving false readings.
2. Stand away from metal objects. Cars, power lines, steel structures, and even belt buckles can distort the magnetic field. Move at least 1015 feet from potential interference.
3. Allow the needle to settle. Wait for the red end (north-seeking end) to stop swinging. It will point toward magnetic north.
4. Adjust for declination. If your compass has a declination adjustment screw, rotate the bezel to match your local declination value. If not, mentally add or subtract the declination from your reading. For example, if declination is 10 east, subtract 10 from your compass bearing to get true north.
5. Mark your heading. Once youve established true north, rotate your body until the compass needle aligns with the orienting arrow. The direction-of-travel arrow now points to true north. The opposite direction is true south.

Always verify your compass reading by taking multiple bearings from different locations. Consistency confirms accuracy.

Step 4: Using the Sun and Shadows (Shadow Stick Method)

If you dont have a compass, you can use the sun to determine direction. This method works best in the Northern Hemisphere between sunrise and sunset.

1. Find a straight stick. Use a 23 foot stick and plant it vertically into level ground.
2. Mark the tip of the shadow. Place a stone or small object at the end of the shadow. This is your first mark.
3. Wait 1520 minutes. The shadow will move as the sun travels across the sky.
4. Mark the new shadow tip. Place a second marker at the new position of the shadows end.
5. Draw a line between the two marks. This line runs approximately east-west. The first mark is west; the second is east.
6. Determine north and south. Stand with your left foot on the first mark (west) and your right foot on the second mark (east). You are now facing true north. Behind you is true south.

This method is surprisingly accurate within 510 degrees under clear skies. Its especially useful in survival situations or when navigating without tools.

Step 5: Using the Stars to Find True North

At night, the North Star (Polaris) is your most reliable celestial reference in the Northern Hemisphere. Polaris lies nearly directly above the North Pole, making it an excellent indicator of true north.

1. Locate the Big Dipper. This constellation is easy to identify and visible year-round in the northern sky.
2. Find the two stars at the end of the bowl. These are called Merak and Dubhe.
3. Draw an imaginary line from Merak through Dubhe. Extend this line about five times the distance between the two stars.
4. Find Polaris. This bright star lies along that line and is the last star in the handle of the Little Dipper.
5. Face Polaris. You are now facing true north. South is directly behind you.

In the Southern Hemisphere, where Polaris is not visible, use the Southern Cross constellation. Draw a line through the long axis of the cross and extend it about 4.5 times its length downward. Drop a perpendicular line from that point to the horizonthats approximate south.

Step 6: Using GPS and Digital Tools

Digital tools offer speed and precision but require understanding their limitations.

1. Ensure your GPS device or smartphone is calibrated. Open the compass app and perform a figure-eight motion to recalibrate the magnetometer if prompted.
2. Enable true north mode. Most GPS apps default to magnetic north. Go into settings and switch to true north or geographic north.
3. Verify location accuracy. Check the satellite count and estimated error (should be under 10 meters). If accuracy is poor, move to an open area with clear sky visibility.
4. Use mapping overlays. Apps like Gaia GPS, Locus Map, or Google Earth allow you to overlay topographic maps and grid lines to confirm orientation.
5. Always carry a backup. Digital devices can fail. Never rely solely on them for critical navigation.

Step 7: Cross-Verify Your Findings

Once youve determined north and south using one method, cross-check with another. For example:

• If you used a compass, verify with the sun shadow method during daylight.
• If you used Polaris at night, confirm with your GPS in the morning.

Consistency across methods confirms accuracy. Discrepancies indicate interference, user error, or environmental distortion. Investigate the cause before proceeding.

Best Practices

Always Account for Magnetic Declination

Magnetic declination is the single most overlooked factor in direction finding. Even a 5-degree error translates to 260 feet off course over one mile. In mountainous or forested terrain, this can mean the difference between finding your way and becoming lost.

Update your declination value annually. Earths magnetic field shifts approximately 0.10.3 degrees per year. Use NOAAs online calculator or printed topographic maps with updated declination notes. If youre working in a region with high declination (e.g., Alaska or northern Canada), carry a declination chart and recalibrate tools frequently.

Calibrate Tools Regularly

Compasses, smartphones, and GPS units degrade over time. Magnetic fields can become demagnetized. Smartphone sensors accumulate drift. Calibrate your compass by comparing it to a known reference point (like a survey marker or true north from Polaris). For smartphones, perform the figure-eight calibration routine every time you enter a new environment or after prolonged storage.

Use Multiple Reference Points

Never rely on a single indicator. In dense forests, compasses can be affected by iron-rich soil or fallen metal debris. In urban areas, steel buildings and underground utilities create magnetic anomalies. Use at least two independent methods to confirm direction. For example: compass + sun + map grid.

Document Your Bearings

When navigating or surveying, record your headings. Note the time, location, method used, and declination value. This creates a verifiable log for future reference or team coordination. In professional settings like construction or archaeology, documented bearings are essential for compliance and reproducibility.

Practice in Controlled Environments

Master these skills before you need them in the wild. Practice in your backyard, a local park, or a marked trail. Use known landmarks and test your ability to return to your starting point using only direction and pacing. Build confidence through repetition.

Be Aware of Local Interference

Many environments have hidden magnetic influences:

• Iron ore deposits can deflect compass needles.
• Underground pipelines and power cables emit electromagnetic fields.
• Vehicle parts, tools, and even some rocks (magnetite) can interfere.

Always test your compass away from equipment. If readings are erratic, move 50 feet and try again. If the problem persists, suspect geological anomalies and switch to celestial navigation.

Use a Declination-Adjusted Compass

Invest in a quality compass with adjustable declination (e.g., Suunto MC-2, Silva Ranger). These allow you to set the declination once, then read true north directly without mental math. This reduces error and speeds up navigation.

Teach Others

Navigation skills are best retained through teaching. Explain your method to a partner. If they can replicate your results, youve mastered it. In group settings, designate a navigator and rotate the role to ensure everyone is proficient.

Tools and Resources

Essential Tools for Picking North South Heads

Having the right tools ensures accuracy and efficiency. Here are the most reliable options:

• Magnetic Compass: A baseplate compass with declination adjustment is ideal. Recommended models: Suunto MC-2, Silva Ranger 1-2-3, Brunton 8010.
• Smartphone Compass Apps: Use apps like Compass Pro, GPS Compass, or Gaia GPS. Ensure they support true north mode.
• GPS Units: Garmin eTrex, Magellan Explorist, or handheld units with GLONASS and Galileo support for improved accuracy.
• Topographic Maps: USGS maps include declination diagrams, contour lines, and grid references. Always carry a paper map as a backup.
• Alidade and Plane Table: For surveyors, these tools allow direct orientation of maps using bearings.
• Protractor and Ruler: For manual map reading and bearing calculation.

Online Resources

These free, authoritative sources provide up-to-date declination data and educational content:

• NOAA National Centers for Environmental Information (NCEI): https://www.ngdc.noaa.gov/geomag/calculators/magcalc.shtml#declination Calculates magnetic declination by latitude/longitude and date.
• USGS Topographic Map Viewer: https://apps.nationalmap.gov/viewer/ Access official maps with declination and grid north indicators.
• TimeandDate.com: https://www.timeanddate.com/sun/ Provides sunrise/sunset times and solar azimuth for shadow method accuracy.
• Stellarium Web: https://stellarium-web.org/ Simulates night sky from any location to identify Polaris and Southern Cross.

Books and Educational Materials

For deeper understanding, consult these authoritative texts:

• Be Expert with Map and Compass by Bjrn Kjellstrm The definitive guide to traditional navigation.
• The Art of Navigation by David Burch Covers celestial and magnetic navigation for sailors and land navigators.
• Land Navigation Handbook by U.S. Army Technical manual used by military personnel for field navigation.

Training Programs

Consider formal training through:

• Outward Bound or National Outdoor Leadership School (NOLS) Offer wilderness navigation courses.
• Local orienteering clubs Host regular events to practice map-and-compass skills.
• Geology and surveying associations Provide workshops on directional measurement in fieldwork.

Real Examples

Example 1: Hiker Lost in the Adirondacks

A hiker in New Yorks Adirondack Mountains became disoriented after a sudden storm obscured landmarks. Her GPS died, and her compass reading seemed inconsistent. She recalled her training and used the shadow stick method.

She planted a 2-foot stick at 10:30 a.m., marked the shadow tip, and waited 20 minutes. The second mark aligned with an east-west line. She faced north and recognized a distant peak shed seen on her map. Using her memory of the maps orientation, she confirmed her heading and navigated back to the trail. Her backup method saved her.

Example 2: Survey Crew in Rural Texas

A land survey team was marking property boundaries in an area with high magnetic anomalies due to iron-rich soil. Their compasses gave erratic readings. They switched to GPS with true north enabled and cross-verified using Polaris at night. They also used a total station with built-in gyroscopic orientation to eliminate magnetic interference. Their final survey was accepted by county authorities because they documented all methods and cross-checks.

Example 3: Archaeological Excavation in Jordan

Archaeologists working at a site near Petra needed to align their excavation grid with true north for precise artifact mapping. They used a theodolite calibrated to true north via Polaris. They also referenced historical maps from British Mandate surveys to verify alignment. Their grid was accurate to within 0.2 degrees, enabling detailed stratigraphic analysis.

Example 4: Drone Operator in the Arctic

A drone pilot mapping glacial movement in Greenland lost satellite signal due to atmospheric interference. He switched to manual heading using the suns azimuth and a magnetic compass. He noted the declination was 22 degrees east and adjusted his drones flight path manually. He recorded bearings every 15 minutes and used the suns position to correct drift. His data remained usable despite GPS failure.

Example 5: Military Reconnaissance in Afghanistan

A special operations team navigated through mountainous terrain without GPS due to jamming. They used the sun during the day and Polaris at night. They carried a declination chart for the region (10 degrees west) and used terrain associationmatching compass headings to ridge lines and valleys. They reached their objective undetected and returned safely, relying entirely on traditional navigation.

FAQs

Can I use my phones compass to pick north south heads?

Yes, but with caution. Smartphone compasses are convenient and often accurate when calibrated. However, they rely on magnetometers that can be disrupted by nearby electronics, metal cases, or magnetic mounts. Always enable true north mode in settings and cross-check with a physical compass or celestial method when precision matters.

What if Im in the Southern Hemisphere?

In the Southern Hemisphere, Polaris is not visible. Use the Southern Cross constellation instead. Draw a line through the long axis of the cross and extend it 4.5 times its length. Drop a perpendicular line from that point to the horizonthats approximate south. You can also use the sun shadow method, which works identically in both hemispheres.

How often does magnetic declination change?

Magnetic declination changes gradually, typically 0.1 to 0.3 degrees per year. In regions near the magnetic poles (like northern Canada or Antarctica), changes can be more rapid. Always check NOAA or your local geological survey for updated values before critical navigation.

Why does my compass point south sometimes?

If your compass needle points south, it may be reversed. Some compasses have a red needle for south (rare). More commonly, the needle is stuck due to magnetic interference or damage. Test it away from metal objects. If it still behaves erratically, replace it.

Can I pick north south heads without any tools?

Yes. In daylight, use the sun and shadow stick method. At night, locate Polaris (Northern Hemisphere) or the Southern Cross (Southern Hemisphere). Even moss on trees can offer a rough cluethough its unreliable, as moss grows on the damp side, which isnt always north. Never rely solely on moss.

How accurate do I need to be when picking north south heads?

Accuracy depends on context. For hiking, 5 degrees is acceptable. For surveying or construction, you need 0.5 degrees or better. Military and scientific applications demand sub-degree precision. Always match your accuracy to your purpose.

Whats the easiest way to remember which way is north?

Use the mnemonic: Magnetic North is where the red end points. In a compass, the red needle always points toward magnetic north. To find true north, adjust for declination. At night, Follow Polaris to true north.

Do I need to recalibrate my compass after traveling?

Yes. Magnetic declination changes with location. Even moving 100 miles can alter the value. Always update your declination setting or mental adjustment when you enter a new region.

Can trees or vegetation help me find north?

Not reliably. While moss often grows on the north side of trees in the Northern Hemisphere due to shade and moisture, this is not consistent. In dense forests, moss may grow on all sides. Never use vegetation as your primary method.

Whats the most common mistake people make?

Ignoring magnetic declination. Most people assume their compass points to true north. It doesnt. Failing to adjust for declination is the leading cause of navigation errors in both recreational and professional settings.

Conclusion

Picking north south heads is more than a technical skillits a fundamental competency for anyone who moves through space with intent. Whether youre traversing a remote wilderness, laying the foundation for a building, or simply exploring a new city, knowing your direction with confidence empowers you to act with clarity and purpose.

This guide has equipped you with multiple methods to determine true north and south, from ancient celestial techniques to modern digital tools. Youve learned how to account for magnetic declination, avoid interference, cross-verify results, and apply best practices in real-world scenarios. Most importantly, you now understand that no single method is foolproof. Mastery comes from redundancy, practice, and adaptability.

Technology will continue to evolve, but the principles of orientation remain timeless. A compass, a stick, and a clear sky are all you need to find your way home. Train yourself to use them. Practice in safe environments. Teach others. Build a mental library of directional cues.

In the end, picking north south heads isnt just about directionits about self-reliance. Its the quiet confidence that comes from knowing you can find your way, even when the world around you has lost its way. Master this skill, and youll never be truly lost.