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Features March 2019 Issue

Overlay Approaches

Overlay Approaches

In the early days of RNAV, regular approaches had overlays that allowed use of GPS for example, and we loved ‘em. Now, they’re (sort of) back.

Let’s connect some dots. In 1969, NARCO (now defunct) introduced the CLC-60 VORTAC Offset Control Panel that allowed navigation to a phantom fix defined as a distance and direction (“rho-theta”) from an existing VORTAC. It was touted as the first RNAV system. In the 80’s, Bendix/King’s KNS-80 Integrated Navigation System might be considered the first practical RNAV navigator (it had VOR, LOC, DME, RNAV, and GS). Like the CLC-60, it could electronically “move” a VORTAC and was IFR certified.

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