In rec.aviation.piloting Mxsmanic wrote:
writes:
You got a true north compass in your airplane?
Both GPS and inertial navigation platforms can easily determine true north.
In fact, they work with true north, and must apply an unpredictable conversion
factor to true north to get current and local magnetic north.
No, they can't.
INS has to be initialized from something known and updated because
gyros in the real world precess.
GPS can tell you which direction you are going, but can not tell you
where the nose of the airplane is pointing.
INS is too big and expensive for GA aircraft.
Not all real airplanes have electrical systems.
--
Jim Pennino
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