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to phase comparison within the receiver. The result is then displayed on indicators (Decometers) which reflect the position of the aircraft as it flies through the pattern coverage. The Decca Navigator System shows the pilot visually the geographical location of his helicopter with a stylus inscribing on a local area map the exact path being flown thus enabling him to fly directly to his destination much as a motorist follows a roadmap. The electronic equipment com- prising the Decca Navigator System is manufactured by the Bendix Corporation, the Laboratory for Electronics, General Precision and other companies. The Air Traffic Division of the FAA in finalizing instrument flight approval with the Decca Navigator System as a primary navigation aid established a route width of 1.5 nm on either side of the track center line; a minimum vertical separation from other aircraft of 1,000 ft.; a holding pattern airspace area of 2.6 nm width and 3.9 nm length provided a hook-type entry is made into the holding area; a radar separation of 3 miles; and, a 1,000 ft. minimum obstruction clearance altitude above the surface. [[500'moca]] Complete segregation of helicopter instrument traffic from the fixed-wing traffic was the project goal in the early stages of the program. After a lengthy and careful study, -10-