Editing Decca Navigator System (section)

=== Delrac ===
In the immediate post-war era, Decca began studying a long-range system like Decca, but using much lower frequencies to enable reception of [[skywave]]s at long distances. In February 1946 the company proposed a system with two main stations located at [[Shannon Airport]] in Ireland and [[Gander International Airport]] in [[Newfoundland]] (today part of Canada). Together, these stations would provide navigation over the main [[great circle route]] between London and New York. A third station in [[Bermuda]] would provide general ranging information to measure progress along the main track.{{sfn|Blanchard|1991|p=303}}

Work on this concept continued, and in 1951 a modified version was presented that offered navigation over very wide areas. This was known as '''Delrac''', short for "Decca Long Range Area Cover". A further development, including features of the [[General Post Office]]'s [[POPI]] system, was introduced in 1954, proposing 28 stations that provided worldwide coverage.{{sfn|Blanchard|1991|p=303}} The system was predicted to offer {{convert|10|mile|m}} accuracy at {{convert|2000|mile|km}} range 95% of the time. Further development was ended in favour of the Dectra system.{{sfn|Blanchard|1991|p=304}}