Cal Maritime Navigation Test One Practice

Which radio navigation system was terminated by the US Coast Guard in 2010 and is no longer in use?

GPS Doppler navigation Loran-C VHF radio direction finding

Correct Answer:

Loran-C

Explanation:

Loran-C was the system that the US Coast Guard terminated in 2010. It’s a long-range radio navigation method that works by using signals from a network of land-based transmitters; receivers measure the timing differences of those signals to determine position. It served for many years, but keeping the transmitter chains ongoing is costly and the accuracy is not as high or as globally reliable as GPS. As GPS became the standard with global coverage, higher precision, and simpler equipment, the Coast Guard phased out Loran-C in 2010. Since then, Loran-C is no longer in active use by the USCG, though the idea of a backup eLoran has been discussed in other regions.

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