AviationBanter - View Single Post

**TheSmokingGnu** · April 5th 07, 06:17 PM posted to rec.aviation.student,rec.aviation.piloting

wrote:
An INS does not contain a gyrocompass.

I thought I read somewhere that certain INS do have a gyrocompass, for
setting the initial positional reference.

The compass (compii??? :P ) in question was erected much faster than a
ship-borne model by being held at magnetic north by a mag compass while
it spun up (so the calibration time was only that to correct for local
variation, and not to find the entire harmonic of the Earth).

In any case, it was useless when actually flying, and the system only
used the accelerometers thereafter.

TheSmokingGnu