FAQ Archive
GPSController FAQs - Page 197
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FAQ
How does fleet software detect and handle GPS spoofing or jamming?
Immune fleet software uses sensor fusion to cross-reference satellite data with other sources like vehicle CAN-bus data (speed, heading), cellular network location, and inertial measurements. It performs real-time signal...
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Why isn't multi-constellation GNSS hardware enough for immunity?
Multi-constellation hardware alone isn't sufficient because the software must perform real-time signal integrity checks—analyzing signal strength, satellite geometry consistency, and implausible acceleration jumps—and ha...
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What does GPS immunity mean for fleet software during signal disruption?
GPS immunity means the software can maintain a verifiable location trail when GNSS signals are jammed or spoofed. It uses continuous location inference by cross-referencing inertial sensor data, cellular tower triangulat...
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When should a fleet consider upgrading to GPS controllers with IMU backup?
Fleets should upgrade when operations go through high-risk zones, require uninterrupted compliance logging, or use location for real-time routing decisions. This is particularly important for cross-border haulage, hazard...
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How accurate is dead reckoning without GPS signals?
Dead reckoning accuracy degrades over time and distance due to sensor drift. It's best for short-term bridging—typically 2 to 5 minutes with reasonable accuracy—to maintain position estimates until GPS signals return. Th...
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How does IMU backup help detect GPS spoofing attacks?
A fused IMU-GPS system compares the movement calculated by the IMU with the GPS signal. If the GPS location suddenly jumps in a way that's physically impossible—which is a classic spoofing signature—it conflicts with the...
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What is dead reckoning IMU backup and how does it help during GPS jamming?
Dead reckoning IMU backup is a system that uses inertial measurement units (IMU) with accelerometers and gyroscopes to estimate vehicle position when GPS signals are lost. It tracks every turn, acceleration, and stop to...
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What's the main risk of GPS signal delay in crowded shipping lanes?
The main risk is positional ghosting where bridge displays show a clear course but the actual hull might be drifting into conflict. An 8-12 second delay creates 50-80 meter errors, causing geofencing alerts to fire too l...
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When should shipping companies upgrade their fleet's GPS controllers for high-risk areas like the Strait of Hormuz?
The trigger is either a recorded incident of navigational drift or expanding trade into high-risk chokepoints. If scheduling regular Hormuz transits in 2026, standard GPS is already underspec. A dedicated marine-grade co...
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Are commercial ships required to have anti-spoofing GPS systems in 2026?
Anti-spoofing GPS is not universally mandated by SOLAS yet. However, port states and major oil terminals are increasingly asking for evidence of resilient positioning for access. Compliance logs showing GPS anomalies can...
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Can radar and visual bearings compensate for GPS lag in marine navigation?
In theory they can, but modern integrated bridge systems often fuse all data with GPS as a primary input. If GPS is lagging, it can skew the fused output, causing radar overlays on charts to appear offset. This creates c...
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How much GPS delay is considered dangerous for cargo ships navigating the Strait of Hormuz?
Any delay causing over 25 meters of error is dangerous. At typical speeds, a 5-second delay can mean a 40-meter error—enough for lane deviation. Consistent delays over 8 seconds require immediate technical review as they...
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