11 Facts About LORAN

LORAN, short for long range navigation, was a hyperbolic radio navigation system developed in the United States during World War II.

LORAN, in its original form, was an expensive system to implement, requiring a cathode ray tube display.

LORAN stated that he was aware of similar work in the UK, but didn't know enough about it to offer any suggestions.

LORAN was ready for deployment, and the first chain went live in June 1942 at Montauk and Fenwick.

In particular, the accuracy offered by LORAN allowed aircraft to reduce the amount of extra fuel they would otherwise have to carry to ensure they could find their base after a long mission.

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LORAN was a simple system that compared the arrival times of pulses to make a measurement.

Raytheon won a contract to develop a system called "Cytac", which used the same basic techniques as LF LORAN, but included considerable automation to handle the timing internally without operator intervention.

LORAN stations were built in chains, one primary and two secondaries typically separated by about 600 miles .

LORAN adopted the use of varying the pulse repetition frequency for this task, with each station sending out a string of 40 pulses at either 33.

Accordingly, the LORAN operator set the delays so the primary signal appeared on one trace and the secondary on the second, allowing the complex patterns to be compared.

AT LORAN, for "Air Transportable", was a lightweight LORAN transmitter set that could be rapidly set up as the front moved.