Re: Inertial Navigation ???

From: (Paul Kearney)
Date:         21 Apr 2000 10:40:51 -0700
Organization: Ireland On-Line Customer
References:   1
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Chris Dahler <> wrote:

::Hmmm.  Actually, the way navigational systems work in Boeing airplanes
::is not by updating the IRS's.  As far as I know, once the IRS's are
::aligned on the ground, their position information cannot be updated
::until the aircraft is stationary again.

::Navigation is actually taking place via the Flight Management Computer
::(FMC).  The FMC accepts navigational inputs from several sources (GPS,
::DME/DME, VOR/DME, IRS).  The FMC chooses which position to accept

Ah,,, cant be right all the time.

Yes... the FMC is updating the position-info it gets from the IRS...
by cross-testing with info from the DME

Youre right I'm wrong.