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In page Loran-C:

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Every LORAN chain in the world uses a unique Group Repetition Interval, the number of which, when multiplied by ten, gives how many microseconds pass between pulses from a given station in the chain. In practice, the delays in many, but not all, chains are multiples of 100 microseconds. LORAN chains are often referred to by this designation, e.g., GRI 9960, the designation for the LORAN chain serving the Northeastern United States.[citation needed]