I. The Carriage Requirement

The International Convention for the Safety of Life at Sea, universally known as SOLAS, is the most important international treaty governing the safety of merchant ships. First adopted in 1914 in response to the sinking of the RMS Titanic, it has been revised and updated continuously, with the current version adopted in 1974 and amended regularly since. As of 2022, 167 contracting states representing more than 99 percent of the world’s merchant shipping tonnage are party to the convention.¹

Chapter V of SOLAS addresses “Safety of Navigation.” Regulation 19, titled “Carriage requirements for shipborne navigational systems and equipment,” specifies what every commercial vessel must carry. Paragraph 2.1.1 is unambiguous: all ships, irrespective of size, shall carry “a properly adjusted standard magnetic compass, or other means, independent of any power supply, to determine the ship’s heading.”²

The regulation requires that this compass be “type-approved by the Administration”—that is, certified by the vessel’s flag state as meeting the performance standards set forth in IMO Resolution A.382(X) and its successor instruments. The IMO’s performance standards for magnetic compasses, further detailed in ISO 25862, specify a maximum permissible directional error of 0.5 degrees under standard operating conditions.³

The compass must be type-approved. The compass must meet accuracy standards. The compass must be properly adjusted. The regulation says all of this. What it does not say—what no regulation in the history of maritime law has ever said—is that the invisible geophysical phenomenon upon which the compass depends for its entire functionality must also be certified, tested, or in any way verified as fit for the purpose to which 112,500 commercial vessels entrust their navigation every day.⁴

II. The Aviation Parallel

The Federal Aviation Administration imposes an identical dependency. Under 14 CFR § 91.205, every powered civil aircraft operating under visual flight rules must be equipped with a “magnetic direction indicator.” The requirement is listed at paragraph (b)(2). It is not optional. It is not waivable. Every certificated aircraft flying in American airspace, from a single-engine Cessna to a Boeing 787 Dreamliner, must carry an instrument whose sole function is to detect and display the orientation of the Earth’s magnetic field.⁵

For instrument flight rules, the requirements expand. Under § 91.205(d), aircraft must additionally carry a “directional gyro,” but even the directional gyro must be periodically realigned to the magnetic compass because it drifts. The magnetic field is the ultimate reference. Every other heading instrument on the aircraft is calibrated against it.⁶

The FAA certifies every navigation aid it operates. VHF Omnidirectional Range stations, known as VORs, must meet the performance standards codified at 14 CFR Part 171, which specify signal accuracy, monitoring requirements, maintenance intervals, and procedures for issuing Notices to Airmen when performance degrades.⁷ If a VOR station drifts by more than one degree, it must be taken offline and a NOTAM issued to alert pilots. This has been the standard since 1946.

The Earth’s magnetic field has drifted by considerably more than one degree. At some locations, magnetic declination—the angular difference between magnetic north and true north—changes by more than 0.2 degrees per year.⁸ No NOTAM has ever been issued. No maintenance action has ever been scheduled. The most widely used navigation reference in the history of aviation has been operating with a known, documented, and continuously worsening accuracy problem for the entirety of powered flight, and the FAA’s response has been to require the pilots to compensate for it themselves.

III. The Navigation Aid

To understand the regulatory absurdity, one must first understand what the Earth’s magnetic field is and how it functions as a navigation aid. This is not a metaphor. The field provides a directional reference signal that is detected by instruments carried aboard every vessel, aircraft, and smartphone on the planet. Under any functional definition, it is a navigation aid. It is simply the only one that has never been asked to apply for a license.

The Earth’s magnetic field is generated by convective currents of molten iron in the planet’s outer core, a layer of liquid metal approximately 2,200 kilometers thick that surrounds the solid inner core. These currents, driven by the planet’s rotation and thermal convection, create a self-sustaining dynamo that produces a roughly dipolar magnetic field extending far into space.⁹

The field’s total intensity at the Earth’s surface ranges from approximately 25 microtesla near the equator to 65 microtesla near the poles. For comparison, a typical refrigerator magnet produces a field of approximately 5,000 microtesla, or about 100 times stronger. The navigation aid upon which the entire global maritime and aviation infrastructure depends produces a signal weaker than one percent of the magnetic field strength of a decorative kitchen accessory.¹⁰

This signal is what the compass needle follows. This signal is what every maritime compass, every aviation magnetic direction indicator, and every smartphone magnetometer detects and interprets as “north.” The signal is real, measurable, and physically present. It is also unreliable, unpredictable, and operated by no one.

IV. The Accuracy Problem

Any certified navigation aid must meet accuracy requirements. Under IMO performance standards, a ship’s magnetic compass must achieve a directional accuracy of 0.5 degrees.³ Under 14 CFR Part 171, a VOR must maintain course accuracy within plus or minus 1.4 degrees for terminal procedures and 4.5 degrees for en-route navigation.⁷ These are hard limits. Exceed them, and the aid is shut down.

The Earth’s magnetic field cannot meet these standards. Its directional reference—the North Magnetic Pole—does not coincide with geographic north. The angular difference between magnetic north and true north, known as magnetic declination, varies by location, by altitude, by time of day, and by year. In some regions, the declination exceeds 20 degrees. In others, it changes direction entirely within a few hundred kilometers.⁸

The North Magnetic Pole itself is not fixed. It is currently located at approximately 86.5°N latitude, 170.9°E longitude, and it is moving. Since systematic tracking began in the early nineteenth century, the pole has migrated more than 2,300 kilometers from its recorded position in the Canadian Arctic Archipelago, heading in the general direction of Siberia. The National Oceanic and Atmospheric Administration’s National Centers for Environmental Information estimates the current drift rate at approximately 55 kilometers per year, a speed that accelerated markedly in the 1990s from a historical rate of roughly 10 to 15 kilometers per year.¹¹

In other words, the primary reference point of the world’s most widely used navigation aid is physically relocating at a rate of 150 meters per day. If a VOR transmitter were observed moving at 150 meters per day, the FAA would issue an emergency NOTAM within the hour. The North Magnetic Pole has been doing this for at least thirty years, and the most the international regulatory community has managed is to update a mathematical model once every five years.

V. The Model That Admits the Problem

That mathematical model is the World Magnetic Model, or WMM, jointly produced by the National Centers for Environmental Information of NOAA and the British Geological Survey. It is the standard reference for magnetic navigation used by the United States Department of Defense, the United Kingdom Ministry of Defence, the North Atlantic Treaty Organization, the International Hydrographic Organization, and essentially every civilian navigation system on Earth. It is embedded in every GPS receiver, every smartphone compass application, and every electronic chart display.¹²

The WMM is updated on a five-year cycle. The current edition, WMM2025, was released in December 2024 and is valid through December 31, 2029. The previous edition, WMM2020, was released in December 2019. The edition before that, WMM2015, was released in December 2014.¹³

The WMM2015 failed. In 2019, three years before its scheduled expiration, the model’s predictions had degraded so severely that the root-mean-square error in grid variation exceeded the 1-degree specification limit established by the Department of Defense. The North Magnetic Pole was moving faster than the model had anticipated. An emergency out-of-cycle update, designated WMM2015v2, had to be issued in February 2019 to correct the errors—an update that was itself delayed by the United States federal government shutdown, during which NOAA staff were furloughed and unable to publish the correction.¹⁴

Consider what this means. The mathematical model designed to compensate for the inaccuracy of the Earth’s magnetic field became inaccurate faster than expected, because the magnetic field was being inaccurate faster than the compensation model could keep up. The backup system for the defective navigation aid was itself defective. And the repair was delayed because the government employees tasked with repairing the backup system for the defective navigation aid were on involuntary leave due to a budget dispute. At no point did any agency suggest that the underlying navigation aid should perhaps be taken offline for maintenance.

VI. The Maintenance Deficit

Under SOLAS Regulation 19, a vessel’s magnetic compass must be “properly adjusted.” The IMO interprets this to require periodic compass adjustment, colloquially known in the maritime industry as “swinging the compass” or “swinging ship.” The procedure involves slowly rotating the vessel through all compass headings while a certified compass adjuster measures the deviation between the compass reading and the known magnetic heading at each point. Correction magnets are then placed in the compass binnacle to compensate for the vessel’s own magnetic field. A deviation card is produced and posted near the compass for the helmsman’s reference.¹⁵

The Australian Maritime Safety Authority requires this procedure after any event that might have disturbed the compass, including structural modifications, changes in cargo, installation of new electrical equipment, or after the vessel has been in a fixed heading for an extended period. The U.S. Navy requires it annually. The FAA recommends an equivalent procedure for aircraft, published as Advisory Circular 43-215, “Standardized Procedures for Performing Aircraft Magnetic Compass Calibration.”¹⁶

Every one of these procedures exists to compensate for the fact that the navigation aid itself—the Earth’s magnetic field—is insufficiently reliable to be used without correction. No other navigation aid in the history of transportation has imposed this requirement on its users. When a VOR transmitter produces an inaccurate signal, the VOR is repaired. When the GPS constellation degrades, the satellites are repositioned. When the Earth’s magnetic field produces an inaccurate signal, the master of the vessel is instructed to hire a compass adjuster and fix the problem himself. The infrastructure compensates for the user. The magnetic field requires the user to compensate for the infrastructure.

The Earth’s magnetic field has not been maintained, serviced, calibrated, or inspected by any entity since the planet formed approximately 4.5 billion years ago. The dynamo that generates the field operates in the outer core at temperatures exceeding 4,000 degrees Celsius, under pressures of 135 gigapascals, in a region no human being has ever visited, observed directly, or been able to influence in any way. The maintenance backlog is total. The maintenance plan is nonexistent. The operator is molten iron.

VII. The Service Outage History

The most concerning aspect of the Earth’s magnetic field as a navigation aid is not its current inaccuracy. It is its demonstrated history of total service failures.

Geomagnetic polarity reversals are events in which the Earth’s magnetic field reverses its orientation entirely: the North Magnetic Pole becomes the South Magnetic Pole, and vice versa. These are not hypothetical. They are documented in the geologic record through the analysis of magnetic minerals in volcanic rocks and ocean floor sediments, which preserve the orientation of the magnetic field at the time of their formation.¹⁷

The United States Geological Survey confirms that these reversals have occurred many times throughout Earth’s history, at intervals ranging from 10,000 years to 50 million years. The most recent complete reversal, known as the Brunhes-Matuyama reversal, occurred approximately 780,000 years ago. Research published in Science in 2019 established that this reversal took approximately 22,000 years to complete, a process involving three distinct phases of field instability.¹⁸

During a reversal, the field does not simply flip cleanly from one orientation to another. It weakens, becomes chaotic, develops multiple magnetic poles simultaneously, and may drop to as little as five percent of its normal intensity. A study published by researchers at the GFZ German Research Centre for Geosciences documented a brief reversal event approximately 41,000 years ago during which the field strength fell to five percent of its present value for a period of approximately 440 years.¹⁹

Five percent of present field strength. For 440 years. In a navigation aid upon which the entire global transportation infrastructure depends. Under current maritime law, a navigation light that goes out for five minutes triggers an incident report. The Earth’s magnetic field went to five percent capacity for four and a half centuries, and there was no filing because the regulatory framework did not yet exist, and if it had, the form would not have contained a checkbox for “planetary dynamo failure.”

The intervals between reversals are not predictable. They are not periodic. They follow no schedule. They are, in the language of geophysics, stochastic. The USGS characterizes the reversal frequency as “random.”¹⁷ Under the product safety frameworks of any developed nation, a navigation aid with a random, unannounced total failure mode and a documented service outage history spanning four and a half billion years would not pass initial certification. It would not be submitted for initial certification. The manufacturer would know better.

VIII. The Field Strength Decline

Even between reversals, the field is degrading. Since Carl Friedrich Gauss conducted the first systematic measurement of the Earth’s magnetic field strength in 1840, the total dipole moment has decreased by approximately nine percent. This is not a contested figure. It is documented in the International Geomagnetic Reference Field dataset maintained by the International Association of Geomagnetism and Aeronomy, updated every five years based on satellite observations and ground-based magnetic observatories.²⁰

Nine percent in 186 years. The signal is getting weaker. The navigation aid is degrading. And it is degrading unevenly: the South Atlantic Anomaly, a region of significantly reduced field strength stretching from South America to southern Africa, has been growing in area and deepening in intensity for decades. Within the anomaly, the field strength drops to approximately 22 microtesla, less than half the global average. Spacecraft passing through the region routinely experience increased radiation exposure and electronics malfunctions because the weakened field provides insufficient shielding against charged particles from the sun.²¹

A navigation aid that is weakening by nine percent per century, producing a signal already weaker than a kitchen magnet, with a documented 60-percent-reduced-strength zone covering a significant portion of the South Atlantic, would, under any reasonable product safety standard, be subject to a recall. Or at minimum, a consumer safety warning. No warning has been issued. The National Geospatial-Intelligence Agency’s response to the problem has been to designate polar regions where compass reliability falls below acceptable thresholds as “Blackout Zones”—areas where the agency acknowledges the navigation aid simply does not work, has included them on the WMM charts, and moved on.²²

IX. The Consumer Device Problem

The regulatory exposure extends far beyond ships and aircraft. Every modern smartphone contains a magnetometer—a sensor that detects the orientation and intensity of the Earth’s magnetic field. Apple’s iPhone, Samsung’s Galaxy line, and every Android device manufactured in the past decade include this sensor as standard equipment. The magnetometer powers the compass application, provides heading data for map navigation, and enables augmented reality applications to orient virtual objects relative to the physical world.²³

There are approximately 6.9 billion smartphones in active use worldwide as of 2024, according to GSMA Intelligence.²⁴ Every one of them depends on the Earth’s magnetic field for directional functionality. Every one of them is, in effect, a compass. And every one of them references the same uncertified, unmonitored, and slowly failing navigation aid as the bridge compass of a 200,000-deadweight-ton crude oil tanker navigating the Strait of Hormuz.

The software layer does attempt to compensate. Google Maps, Apple Maps, and every major navigation application incorporate the World Magnetic Model into their heading calculations, applying a declination correction based on the user’s GPS coordinates and the current date. This means that 6.9 billion consumer devices are running a software patch for a defective navigation aid, updated on a five-year cycle, produced by two government agencies in two countries, based on measurements from a constellation of satellites and a network of ground observatories that together attempt to model the behavior of convective iron flows 2,900 kilometers below the surface that no instrument can directly observe.

The patch failed once already, in 2019. No consumer was notified.

X. The Type Approval Void

The type approval process for maritime navigation equipment is administered by flag state administrations under the framework established by SOLAS and elaborated by the IMO’s Maritime Safety Committee. A compass manufacturer—Ritchie Navigation, Cassens & Plath, Yokogawa Denshikiki, or any other—must submit its product for testing at an accredited laboratory, demonstrate compliance with the ISO 25862 standard and the relevant IMO performance resolutions, and receive a type approval certificate valid for five years. The certificate is recorded in the flag state’s registry and may be queried by port state control officers during inspections.²⁵

The compass is type-approved. The compass binnacle is type-approved. The corrector magnets are type-approved. The deviation card is prepared by a certified compass adjuster. The entire supply chain from the compass needle to the helmsman’s eye is certified, inspected, and documented. The magnetic field that makes the needle point in a direction—any direction—is not.

This is as if the Federal Communications Commission type-approved every radio receiver in the country while exempting the radio transmitter. It is as if the Food and Drug Administration certified every pharmacy while exempting the pharmaceutical manufacturer. The downstream equipment is held to exacting standards. The upstream signal source upon which all of that equipment depends has never been submitted for evaluation, and no regulatory body has jurisdiction to require it.

The IMO cannot regulate the Earth’s outer core. The FAA cannot issue an airworthiness directive to a planetary dynamo. The International Association of Geomagnetism and Aeronomy can measure the field and publish models of its behavior, but it cannot file a corrective action request with the operator because there is no operator. The entity responsible for generating the navigation signal is a layer of liquid iron alloy 2,200 kilometers thick, operating at temperatures that would vaporize any inspection instrument, under pressures that would collapse any structure designed to house one. The regulator has no contact information for the service provider. The service provider has no contact information for anyone.

XI. Conclusion

The evidence is not ambiguous. SOLAS Chapter V, Regulation 19 requires every commercial vessel on Earth to carry a navigation instrument whose entire functionality depends on the Earth’s magnetic field. 14 CFR § 91.205 requires every powered civil aircraft in American airspace to do the same. The IMO requires that these instruments be type-approved, calibrated, and maintained. The FAA requires that its certified navigation aids meet accuracy standards and be taken offline when those standards are not met.

The Earth’s magnetic field satisfies none of these requirements. Its primary reference point is migrating at 55 kilometers per year. Its signal strength has declined nine percent in less than two centuries. Its accuracy varies by more than 20 degrees across the planet’s surface, with no two locations experiencing the same error. It has documented total service failures lasting thousands of years, occurring at random intervals, with no advance warning system. Its operator is molten iron at 4,000 degrees Celsius. Its maintenance history is blank. Its type approval certificate does not exist.

One hundred and twelve thousand five hundred commercial vessels, approximately 28,400 commercial aircraft, 52,600 military aircraft across 161 nations, and 6.9 billion smartphones navigate by this signal every day. The entire regulatory apparatus of international maritime and aviation safety has been constructed around the assumption that this navigation aid will continue operating within acceptable parameters. That assumption is based on nothing. The field has reversed polarity hundreds of times. It is currently weakening. Its mathematical model had to be emergency-patched in 2019 because it was wrong, and the patch was delayed because the people responsible for issuing it were not being paid.

The Earth’s magnetic field is the oldest, most widely used, least reliable, and only completely unregulated navigation aid in the history of human transportation. Every compass on every ship, every magnetic direction indicator on every aircraft, and every magnetometer on every phone in every pocket on the planet depends on it. No one is responsible for it. No one can fix it. No one can turn it off. And no one has ever asked whether it should be certified, because the answer would be that it cannot be, and the implications of that answer would require rethinking the entire foundation of magnetic navigation, which has been in continuous use since the Chinese Song Dynasty in the eleventh century, and which no regulatory body has the budget, the mandate, or the engineering capability to replace.

The compass points north. North is moving. The agencies have noticed. They have updated their models, designated their Blackout Zones, and continued to require every vessel and aircraft to carry an instrument that detects a signal no one controls from a source no one can inspect providing a reference no one can guarantee.

Ergo.