We Stopped Looking Up

The world has lashed itself to a single signal — one that can be faked, jammed, or undone by the sun. In the Strait of Hormuz this spring, the bill came due. And the oldest craft at sea has quietly begun to come back — not in our hands, but as a machine.

There is a sextant in deep storage somewhere in my life at sea, and the honest truth is that it never comes out. I learned to use one at fourteen, because aboard the boat I grew up on it was simply how you fixed your position: a body, a horizon, a precise time, and a few minutes of arithmetic that ended in a small triumph — a pencil cross on a chart you had earned. It is a craft three centuries deep, and for the few years I truly leaned on it, it was also the thing that could fail you. The chronometer drifted. The horizon hazed. Cloud closed the sky for days. Then satellite navigation arrived and took all of that away, and like everyone else I was glad to be rid of it. I picked the sextant up again years later to sit my Master's celestial ticket, and I have barely touched it since.

The bridge I stand on today is a wall of glowing screens: ECDIS at the centre, and behind it a stack of electronic backups, each confirming the others to the metre. Even the Admiralty paper charts that every watchkeeper once grew up on have all but vanished. What I keep for the day the lights go out lives in the bottom drawer of the chart table, and it is not the sextant — it is a set of paper charts. Because if the signal died under me in mid-ocean tomorrow, I would not climb onto the bridge wing with a mirror and the sun. I would run dead reckoning — course, speed, time, the oldest arithmetic afloat — and pick up the land by eye when it rose. The sextant is a thing I can do. It is no longer a thing I do. And I am, by trade, one of the people who still can.

What we did not notice, because no one announces it, is that we had quietly handed the entire enterprise of knowing where we are to one signal, beamed from one set of ageing satellites, that anyone with the right transmitter can counterfeit — and that the sun itself can switch off.

II.

The consequence has been on open display this spring, and it has not finished flickering across the tracking screens — not even now, with the shooting stopped on paper.

Since the end of February, when coordinated strikes against Iran lit up the electromagnetic environment of the Persian Gulf, the Strait of Hormuz has become the clearest demonstration yet of how thin the thread is. Mariners transiting one of the most important 21 miles of water on earth — the passage carries roughly a fifth of the world's seaborne oil — have looked at their chart displays and seen impossible things. Supertankers circling over dry land. Container ships crossing an airport. Vessels drifting through a nuclear power station. None of it real. All of it rendered with the calm authority of a working instrument.

This is the part that should frighten a navigator. A jammed signal announces itself; the screen goes dark and you know you have lost it. A spoofed signal does the opposite. It hands you a plausible, confident, wrong position and invites you to act on it. The receiver shows a fix. The crew trusts the display. The location is a lie.

The scale is not anecdotal. In the first day after the strikes, more than 1,100 ships in the Gulf were thrown false positions; by mid-March, maritime-AI firms counted interference across well over 1,600 vessels, and at the height of it traffic through the strait fell toward single digits in a day, against the 130-odd a normal day would see. As I write, a US–Iran memorandum signed at Versailles this week is reopening the passage toll-free — for sixty days, at least, with the rest left to negotiate. But the framework that quiets the missiles does nothing for the signal: mariners are still being warned to treat spoofing and jamming as a standing navigational hazard. And this is no longer a regional freak. Through 2025, electronic interference spread from the Black Sea and the Baltic to the Middle East until industry analysts simply began calling it endemic, with one quarter alone logging more than ten thousand affected vessels — an eightfold jump on the quarter before.

III.

The cruel elegance of it is that the lie does not stay aboard the ship that's been fooled.

Every vessel's AIS beacon — the transponder that tells the rest of the world its name, course, and position — is fed by the same compromised receiver. So when the position is spoofed, the false location radiates outward to every other ship, every coastal authority, every insurer and commodities desk that has come to treat that data as ground truth. One corrupted receiver becomes a hundred ships that cannot trust what they see around them, in a 21-mile channel where the average day moves a hundred and thirty hulls, many of them enormous. Some captains, denied a reliable fix, have been forced back onto radar, binoculars, and the shoreline itself — to steer, in the words of one account of the crisis, by eye.

And here is the trap that turns a navigation problem into a financial one. A resourceful crew might reach for a workaround — a tablet with a better, multi-constellation chip, anything to cross-check the lie. But if a collision followed and an investigator found the crew had relied on any unapproved system, the insurance payout may simply not come. So the better instrument stays boxed up, unused, exactly when it is needed most. We have built a system so dependent on one fragile signal that even the act of doubting it can be made to cost you.

How did we get here? The same way we always do. The civilian GPS signal almost every commercial ship leans on is unencrypted — it carries no way to prove it is genuine — and the receivers reading it are, on many vessels, fifteen years out of date, listening to a single frequency from a single constellation. It worked beautifully for thirty years, so we stopped asking what would happen the day it didn't.

IV.

There is one more adversary, and it is the one you cannot sanction, jam back, or negotiate with.

In May 2024, the most intense geomagnetic storm in two decades struck the planet. Charged particles from the sun tore at the ionosphere that GPS signals must pass through, and the fixes degraded — not in some war zone, but over the farms of the American Midwest, where tractors steering themselves by satellite simply stopped in the fields during planting season. High-precision positioning suffered outages lasting fifteen to twenty hours; position errors ran to seventy metres; the storm was estimated to have cost the farming community around half a billion dollars. The same class of event can damage the satellites themselves in orbit.

A spoofer has a transmitter you can find and an interest you can deter. The sun has neither. Space weather is not a question of if but of when and how hard, and the eleven-year solar cycle guarantees the next severe storm is already on its way. A position system that depends on a signal threading the ionosphere has, built into its physics, a failure mode with no enemy and no fix — only a forecast.

Starlight does not pass through the ionosphere the way an L-band signal does. The stars cannot be spoofed, because no one transmits them. They cannot be jammed, because there is nothing to drown out. And they cannot be switched off by the same storm that takes the satellites down. The oldest navigation reference we have is also, it turns out, the most sovereign one — it answers to no operator, no constellation, no government, and no weather in space.

Which is why, while the rest of us were busy forgetting, a quiet few were remembering.

The United States Navy, which had let celestial navigation lapse, put it back into the pipeline a decade ago — relearning the sextant and teaching cadets a computer program that finds latitude and longitude from the stars. That is the craft preserved. The more interesting work is the craft rebuilt: research labs and a handful of companies have been turning the sextant into a machine — sky-facing cameras that photograph the star field, identify it against a catalogue, and compute a position with no signal coming in and none going out. The defence-research arm Draper has patented a star-tracker pitched as exactly this kind of GPS-independent backup, with claimed accuracy inside fifty metres; others have built optical systems sold on a single promise — passive, unjammable, available anywhere the sky is clear. It is the sextant, automated, taking sights all night instead of twice a day.

It is not a finished answer. The honest objection — and it is a fair one — is that the cheaper fix is better receivers: authenticated signals, multiple constellations, the kind of antenna a modern phone already carries. Clouds still close the sky. The old craft alone cannot run a container terminal's schedule. The real future is almost certainly not the sextant or the satellite but both, each watching the other for the moment one starts to lie.

But notice what the system itself has been reduced to telling mariners in the Gulf this spring: fall back on radar, on visual bearings, on what you can see. Look up. Look out. Trust the world in front of you over the number on the screen. We spent a generation engineering our way out of needing to do that, and the first serious test handed the advice straight back.

I think often, now, about that sextant in storage — and about the fact that I will not be the one to dust it off. I am trained for it, and still, if the screens went dark mid-ocean, I would run dead reckoning and make for the coast before I climbed out with a mirror and the sun. That is not laziness. It is the measure of how completely we have retired the craft: the skill survives in a few of us like a dead language — readable, no longer spoken. So I have stopped believing the answer is a generation relearning the sextant by hand. It won't happen. But the sky that craft once read is still up there, indifferent to every transmitter and every solar storm — the one reference no one ashore can corrupt and the sun cannot switch off. A vessel ought to be able to find itself by looking at it. So, I'd argue, ought a civilisation. The honest way back is not to ask us to look up again — we won't — but to build the thing that never stops looking, and let it stand the watch the rest of us have quietly stood down from. We have spent this edition on a seabed we have barely seen and a sea we are emptying: failures, both, of the plain discipline of attention. The sky is the third. We stopped looking up. The work now is to make something that looks in our place.

Sources

The Waypoint triangulates every material, dateable, or contested claim across multiple independent sources. In-text figures below are drawn from the reporting and research listed here; live links appear in the colophon that follows.

The Strait of Hormuz disruption (2026). Reporting on spoofed positions, vessel counts, and collapsed transit volumes is drawn from Scientific American's investigation of GPS spoofing in the strait; gCaptain's coverage of the Joint Maritime Information Center advisories; and tracking data published by the maritime-intelligence firms Windward and Pole Star Global.

The June 2026 US–Iran memorandum and the reopening of the strait. The terms of the 14-point memorandum of understanding — the toll-free reopening of the Strait of Hormuz for an initial 60 days, the lifting of the US naval blockade, and the cessation of fighting — together with the fact, date and place of its signing (a hard copy signed by President Trump at the Palace of Versailles on 17 June 2026, the document also signed electronically by both presidents, with Iran's foreign ministry declaring it in effect and the previously planned Geneva ceremony stood down) are drawn from reporting by Al Jazeera, NBC News, CNN and ABC News from the G7 summit at Evian and the Versailles dinner. The persistence of GNSS interference through the reopening is drawn from current US Maritime Administration advisories and daily tracking by Windward.

Scale and spread of interference (2025–2026). Figures on the first-day vessel count, the broader regional totals, and the characterisation of interference as endemic are drawn from Windward and Orca AI tracking as reported by Focal Point Positioning, alongside the January 2026 Royal Institute of Navigation report drawing on surveys of more than 100 sector experts and 300 vessel captains.

The AIS-propagation and insurance problem. The mechanism by which a spoofed receiver corrupts a vessel's AIS broadcast, and the insurance exposure created by unapproved workarounds, are drawn from Scientific American (citing Todd Humphreys, University of Texas at Austin) and from Fortune's analysis of AIS as unverified, self-reported data.

The June 2025 tanker collision. The suspected role of navigation interference in the collision of the Adalynn and Front Eagle off the UAE is reported as a contributing factor under investigation and is treated here as provisional, not established.

Space weather and GNSS. The May 2024 geomagnetic storm and its effect on positioning — outage durations, position errors, agricultural losses, and risk to satellites in orbit — are drawn from peer-reviewed analysis in Space Weather (Yang et al., 2025) and Advances in Space Research, from GPS World's contemporaneous reporting, and from preprint analysis of the Gannon storm's effect on satellite drag and electronics.

The return of celestial navigation. The US Navy's reinstatement of celestial-navigation training and the STELLA program are drawn from the Center for International Maritime Security; the automated star-tracker work from Inside GNSS's reporting on Draper's patent and from Optical Physics Company's published description of its optical celestial system.

Location: Strait of Hormuz — 26.57° N, 56.25° E