Thanks for the replies.
As suggested a search - when server loads permit
yielded the following 2 threads:
www.pprune.org/ubb/NonCGI/Forum3/HTML/000151.html
www.pprune.org/ubb/NonCGI/Forum3/HTML/001257.html of which the first is by far the more detailed. The original source ref for most of the detail is
The Complete Air Navigator by AVM D C T Bennett.
With regard to altitude measurement, is GPS accurate enough to substitute for radar altimetry? The newer alts I gather only read up to 5000' whereas the in-flight procedures talk of alts up around 20000' - not that my narrow bodied 'light metal', will flying up there
.
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