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Old 21st Oct 2009, 23:51
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galaxy flyer
 
Join Date: Dec 2002
Location: Where the Quaboag River flows, USA
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SOAB

Thanks for the very complete answer on how EGPWS gets its positional information and I agree except:

If an FMS uses GPS positional information for FMS Approach, in non-WGS-84 airspace, one must disable the GPS receivers and use DME-DME FMS information for FMS Approach or go Raw Data. GPS cannot be used for approach navigation in non-WGS-84 locales. Yes, the EGPWS works fine with GPS in non-WGS-84 airspace for warnings. Be careful about datums and the CIS isn't about to change to WGS-84.

GF
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