Michael, Thanks for your essay on the navigation of large aircraft. >... You wrote that: >It is possible to look up the GPS altitude but it's not used for any purpose. >We still use the same pressure level converted to a Flight Level(1013 hPa) or >an altitude MSL based on a local altimeter setting (QNH)...
When and where do the pilots key local altimeter data into the flight computers, and in what units (hPa, or km in Eastern countries)? What are the units of instrument display(s)? Is there a separate *radar* altimeter for clearance of mountain peaks? (in addition to the "local" altimeter?) Gene Mechtly.
