PPRuNe Forums - View Single Post - GPS use for NAV when coded not in WGS84

2nd Jan 2010, 00:24

#12 (permalink)

galaxy flyer

Join Date: Dec 2002

Location: Where the Quaboag River flows, USA

Age: 71

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777AV8R

Thanks!

Boroda

I just looked up the Airbus 320 limitations on Smart Cockpit. It looks just like my plane--if GPS (FMS) in non-WGS-84 airspace, is used, the raw data, ground-based navaid must displayed or GPS must be deselected, in other words, ground-based navaids are necessary. That limitation applies for in-flight purposes, the other choice is to survey the approach fixes, that is, take a GPS receiver out to the physical location of each fix and cross-check the GPS-derived position against the charted position. Not very practical. RNAV (GPS) or RNP approaches require using WGS-84, no exceptions.

GF

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