The Backup for GPS Isn't in the Sky. It's Already on the Ground.

The United States and most industrialized nations do not have a backup for GPS. That is not a hypothetical gap. GPS is a single layer with no second system behind it, and when it goes, everything built on top of it goes too. We are watching that happen right now.

The Gulf is the live proof

Since late February, GPS jamming and spoofing tied to the US-Iran conflict have blanketed the Persian Gulf. In Dubai, one of the most connected cities on earth, the failure shows up in the most ordinary places. Phones place people hundreds of kilometers away. Delivery drivers appear on the map floating in the Gulf while standing on a sidewalk. Ride-hailing pickups fail because neither the driver nor the rider is where the app says they are. Deliveries that should take 15 minutes take 30. Turn-by-turn navigation, the quiet layer underneath ride sharing, food delivery, mapping, and logistics, cannot be trusted. The disruption has dragged on for months and is still flaring today.

And daily life has no fallback. There is no second app to open when the map itself is wrong. A modern economy ran straight into the limit of its primary positioning layer.

Why the fix isn't in the sky

GPS signals travel from satellites roughly 20,000 km up into space, and by the time they reach the ground they are faint. They are easy to drown out with a stronger ground signal and easy to fake. A civilian GPS receiver has no built-in way to prove the signal it is hearing is real. And GPS is not the only constellation up there. Europe, Russia, and China run their own satellite navigation systems, known together with GPS as Global Navigation Satellite Systems (GNSS), and every one of them shares the same weakness: faint signals from space, easy to drown out from the ground.

More satellites will not fix this. Almost all of the new satellites launching into low- or mid-Earth orbit are communications systems: they beam internet, not positioning. Turning them into a navigation service is still a research project. While dedicated LEO navigation constellations are in development, full constellations are years away, unproven at the scale GPS runs today, and still broadcasting from the sky. The physics does not change: a transmitter on the ground is thousands of times closer than any satellite, and closer wins. The answer starts with a layer that does not depend on satellites at all.

The backup is already built

Modern cities, ports, and industrial sites already run dense wireless infrastructure: 5G and WiFi, deployed, powered, and connected. ZaiNar turns that infrastructure into a positioning system. We compute location from the RF signals already moving through the network, in software on the infrastructure, with no satellites in the loop and no new hardware on the devices being located. It delivers centimeter-level accuracy indoors, underground, and in exactly the conditions where satellite positioning fails.

When GPS is jammed or spoofed, a network-based layer keeps producing position from signals on the ground, because it never depended on the sky. These signals are orders of magnitude stronger than anything arriving from orbit. They already reach indoors and underground, and drowning them out takes far more power than it ever took to silence GPS. And because ZaiNar reads signals already present, there is nothing on the position side to spoof, and nothing overhead to jam.

This is national infrastructure, not just maps

The stakes are larger than a delivery app routing badly. GPS is the silent timing source underneath financial settlement, telecom synchronization, the power grid, and transportation. Positioning, navigation, and timing (PNT) is critical infrastructure, and most countries have hung nearly all of it on satellite signals that anyone with a strong enough transmitter can drown out. No single system replaces that, and a resilient PNT architecture will be layered. But the terrestrial positioning layer does not have to be built from scratch. It can run on networks that are already deployed. And ZaiNar's system is built on the problem underneath all of it: synchronizing the network's own clocks to sub-nanosecond precision, with no satellite in the loop. The resilience requirement is real and well understood. What is new is that the hardware to meet much of it is already installed.

Turn it on

Partners across the Gulf are asking for this now, because they are living the failure in real time. The lesson generalizes. Countries that treat GPS as their only positioning layer will keep discovering the gap at the worst possible moment. Countries that turn on the networks they already run will have a fallback. Turning it on is a software deployment, not a construction program. The infrastructure is already there. It just needs to be switched on.