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Fergus Kyle
Joined: 03 Jun 2007
Posts: 291
Location: Burlington ON Canada
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 Posted: Thu Jan 03, 2008 8:39 am Post subject: Compass Requirements in Experimental Aircraft |
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Hey,
I don't understand why the title is distinct to Experimental
aircraft. The compass requirement is the same for any device that moves in a
medium if true motion is to be understood. This includes river current,
tidal motion and other media.
Navigating "by DG" is only valid when the directional gyro is
regularly readjusted to the valid magnetic heading* _ (that's why you start
out by setting it on the runway for take-off - no need for GPS). There is no
need to duplicate the EFIS reading on another display, so it's really only
for Heading. It precesses, that's why it needs to be adjusted every ten
minutes or so - depending on ground speed. *If you were to fly in the Arctic
areas, it might be set to GRID north settings, but that's another story.
Taking "Mag var" - may we presume 'magnetic variation'? - from
anything but the CURRENT chart for same is tantamount to searching in 1880
for clues to Kennedy's assassin. That's why the rate of change of magnetic
variation is published - so one may calculate the present Variation. EFIS
changes nothing of import.
What is has to do with 'Experimental' beats me.
Ferg
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Fergus Kyle
Joined: 03 Jun 2007
Posts: 291
Location: Burlington ON Canada
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| Posted: Thu Jan 03, 2008 8:42 am Post subject: Compass Requirements in Experimental Aircraft |
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PS: On this topic, and ATC vectoring, Matt Prather (q.v.) has it down pat -
dead on.
Ferg
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