Page 123 - Electronic Navigation Cyber Book

number of pulses transmitted per second). The pulse repetition rate
differs between station pairs in the same chain.

Loran-A was finally phased out in the United States in 1980 and replaced
by Loran-C. The use of Loran-A continued in other parts of the world for
a time before a change was made to the more universal Loran-C. The
last operational Loran-A chains were based along the coast of China. The
Loran-C system evolved from Loran-A and the basic principles of both
systems are the same.

Loran-C coverage

DECCA: This service is no longer in use

OMEGA : This service is no longer in use

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