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Published online by Cambridge University Press: 23 November 2009
For many years there has been keen interest, especially in the avionics industry, in the possibility of devising some airborne device which would warn aircrew of an impending mid-air collision. At sea, the use of radar as a collision-warning device is now common, and the carriage of a computer-based collision warning device on tankers in US waters is expected to become mandatory in the near future.