Which statement about eLORAN is NOT correct?

Which statement about eLORAN is NOT correct?

• A. Added encryption and authentication make e-LORAN spoof-proof
• B. The signal is 3-5 million times stronger than GPS/GNSS
• C. Usable anywhere, penetrates all buildings, structures, tunnels, underground, underwater without amplification
• D. Reported accuracy as good as ± 0.2 miles

Answer: (D)

eLORAN is a ground-based navigation system that uses low-frequency, high-power transmissions from distributed transmitters and measures differences in signal arrival times to determine position. Because the signals travel at long wavelengths and come from tall, widespread transmitters, they propagate well through ordinary environments and can be received indoors and in some challenging locations, which is part of why eLORAN is touted as robust and reliable when satellite navigation is degraded. The system also incorporates encryption and authentication features to reduce the risk of spoofing, adding a layer of integrity to the navigation data. When it comes to accuracy, eLORAN delivers position information with tens of meters of precision under typical conditions, and sometimes better with corrections and favorable geometry. Claiming an accuracy of only ±0.2 miles (about 320 meters) would be much worse than what the system can routinely provide. So that statement isn’t correct because real-world eLORAN accuracy is generally in the tens of meters, not as coarse as 0.2 miles.

eLORAN is a ground-based navigation system that uses low-frequency, high-power transmissions from distributed transmitters and measures differences in signal arrival times to determine position. Because the signals travel at long wavelengths and come from tall, widespread transmitters, they propagate well through ordinary environments and can be received indoors and in some challenging locations, which is part of why eLORAN is touted as robust and reliable when satellite navigation is degraded. The system also incorporates encryption and authentication features to reduce the risk of spoofing, adding a layer of integrity to the navigation data.

When it comes to accuracy, eLORAN delivers position information with tens of meters of precision under typical conditions, and sometimes better with corrections and favorable geometry. Claiming an accuracy of only ±0.2 miles (about 320 meters) would be much worse than what the system can routinely provide. So that statement isn’t correct because real-world eLORAN accuracy is generally in the tens of meters, not as coarse as 0.2 miles.