![]() ![]() The 'low frequency' signalling of the Decca system also permitted its use on submarines. In order to maintain secrecy, frequencies were changed at irregular intervals. The purpose of this chain was to provide accurate air navigation for the corridor between Western Germany and Berlin in the event that a mass evacuation of allied personnel may be required. The Master station was in Bad Iburg near Osnabrück and there were two Slaves. established a confidential chain in Germany. Two chains in Vietnam were used during the Vietnam War for helicopter navigation, with limited success.During the Cold War period, following WWII, the R.A.F. ![]() Four chains were planned for Nigeria but only two were built and these did not enter into public service. ![]() Other chains were established in Japan (6 chains) Namibia and South Africa (5 chains) India and Bangladesh (4 chains) Canada (4 chains around Newfoundland and Nova Scotia) North-West Australia (2 chains) the Persian Gulf (1 chain with stations in Qatar and the United Arab Emirates and a second chain in the north of the Gulf with stations in Iran) and the Bahamas (1 chain). ![]()
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