On Mon, 13 Oct 2003 19:16:22 +0000 (UTC), Paul Lonsdale
wrote:

The Boeing 777 has a unit called an ADIRU which comprises 3 IRUs and 3
ADCs in one unit with built in redundancy.

GPS inputs to the Flight Management Function come from MMRs (Multi-Mode
Receivers) which comprise VOR/ILS/MMR/GPS/Marker in one box. (There are
three of these per aircraft).

enter Mr Ray to mention things like KALMAN filters and use phrases
like 'when i learned to fly' 'i used to design navigation systems'