GPS

How GPS Works

GPS determines position by comparing the timing of signals from multiple satellites, then solving for latitude, longitude, and usually time. That time-based measurement model is what makes it useful for navigation, asset tracking, fleet systems, and any device that needs a consistent location or clock reference.

Why GPS Matters in Security and Operations

Because GPS is embedded in everything from phones to industrial and transport systems, it often becomes a hidden dependency rather than a visible feature. When it is accurate and available, it supports routing, geofencing, logging, and time synchronisation, all of which can affect security decisions and operational integrity.

Loss of signal, degraded accuracy, or manipulated location data can cascade into bad routing decisions, incorrect event timestamps, and control failures in systems that assume trustworthy position or time.

Common Ways GPS Fails or Is Abused

GPS is vulnerable to jamming, which blocks the satellite signal, and spoofing, which feeds a receiver false timing or location data. Those attacks matter because many systems treat location and time as trusted inputs, even when the receiver has limited ability to verify them independently.

In practice, the risk is often not just that a device is “wrong”, but that downstream systems accept the wrong data as truth. That can affect tracking, incident reconstruction, access decisions tied to location, and any workflow that depends on timing precision.

How Organisations Validate and Protect GPS Dependencies

Organisations should know where GPS is used, what decisions depend on it, and what happens if it becomes unavailable or unreliable. The core check is whether the system can tolerate degraded positioning or time, or whether it needs fallback sources such as alternative timing references, inertial sensors, network time, or manual override processes.

Where GPS is operationally important, the most effective controls are usually redundancy, anomaly detection, and clear assumptions about trust. NIST SP 800-53 Rev 5 Security and Privacy Controls is a useful reference for mapping those protections to broader control families, while NIST Cybersecurity Framework 2.0 helps align GPS-dependent services with identify, protect, detect, respond, and recover practices.

For systems that use GPS for platform, sensor, or API-adjacent trust decisions, CIS Benchmarks can help harden the surrounding infrastructure, while NIST Privacy Framework is relevant where location data itself creates privacy exposure.

Risk and Threat Considerations

GPS risk is less about the satellite constellation itself and more about the trust that downstream systems place in a weakly authenticated signal. If an attacker can jam or spoof the receiver, they may disrupt navigation, conceal movement, or inject false location and time data into systems that assume the input is trustworthy.

Failure mechanism: The receiver accepts weak, delayed, or counterfeit signals and propagates the resulting location or time error into dependent applications, logs, or control logic.

Impact: Organisations can lose tracking accuracy, misorder events, make bad operational decisions, or trigger incorrect security and compliance actions based on false time or place data.

Practitioner Guidance

What to watch for: Treat GPS as a dependency that needs monitoring, not a universal source of truth. Watch for sudden coordinate jumps, inconsistent time sources, loss of satellite visibility, or discrepancies between GPS and other trusted telemetry.

Governance implication: Systems should define what happens when GPS is degraded, unavailable, or suspicious, including who owns the fallback decision and which applications are allowed to trust it for operational or security use.

Related resources from NHI Mgmt Group

• What do teams get wrong about GPS and location-based automation?
• How should security teams use location clustering to detect mobile fraud without overreacting to noisy GPS data?
• Why do raw GPS and IP signals often fail to reveal coordinated mobile abuse?
• What should fleet operators do first when a vehicle GPS tracker can be remotely abused without authentication?