Compass trouble

"Jay Somerset"
You would have to taxi
for at least 50-100 yards to have a reliable track.

But yes, in theory, this would work.
--
Jay

No. 10 or 20 feet will be just fine.

On Fri, 18 Apr 2008 09:51:13 -0700, "karl mcgruber" skywagon
wrote:



"Jay Somerset"
You would have to taxi
for at least 50-100 yards to have a reliable track.

But yes, in theory, this would work.
--
Jay

No. 10 or 20 feet will be just fine.

No it won't. Watch a stationary GPS give you a position that wobbles
up to 20-50 feet away from its centroid. If you use a very short
track, you could be out way more than the allowable compass deviation.

Simple geometry -- work out the angular error with just a 10 foot
lateral error from a 20 foot base. (Hint: 30 degrees)
--
Jay (remove dashes for legal email address)

Your math is simply complete BS, as well as your 50-100 yards.



"Jay Somerset" wrote in message
...
On Fri, 18 Apr 2008 09:51:13 -0700, "karl mcgruber" skywagon
wrote:



"Jay Somerset"
You would have to taxi
for at least 50-100 yards to have a reliable track.

But yes, in theory, this would work.
--
Jay

No. 10 or 20 feet will be just fine.

No it won't. Watch a stationary GPS give you a position that wobbles
up to 20-50 feet away from its centroid. If you use a very short
track, you could be out way more than the allowable compass deviation.

Simple geometry -- work out the angular error with just a 10 foot
lateral error from a 20 foot base. (Hint: 30 degrees)
--
Jay (remove dashes for legal email address)

On Sat, 19 Apr 2008 19:39:48 -0700, "karl mcgruber" skywagon
wrote:


"Jay Somerset" wrote in message
.. .
On Fri, 18 Apr 2008 09:51:13 -0700, "karl mcgruber" skywagon
wrote:



"Jay Somerset"
You would have to taxi
for at least 50-100 yards to have a reliable track.

But yes, in theory, this would work.
--
Jay

No. 10 or 20 feet will be just fine.

No it won't. Watch a stationary GPS give you a position that wobbles
up to 20-50 feet away from its centroid. If you use a very short
track, you could be out way more than the allowable compass deviation.

Simple geometry -- work out the angular error with just a 10 foot
lateral error from a 20 foot base. (Hint: 30 degrees)
--
Jay (remove dashes for legal email address)
Your math is simply complete BS, as well as your 50-100 yards.

And I suppose you believe the world is flat, as well.

If you are so convinced that I am wrong, and that you can get a good
deviation card using a 10-20 taxi, then go ahead. And when you get a
"say heading" from ATC, don't say I didn't warn you.

But then, MS Flight Sim probably doesn't ever give you that audio, so
you probably won't hear it after all.
--
Jay (remove dashes for legal email address)

But then, MS Flight Sim probably doesn't ever give you that audio, so
you probably won't hear it after all.
--
Jay (remove dashes for legal email address)


Since "somerset" doesn't appear in the FAA pilot database, I'd be guessing
you're the one playing games while I'm out flying for a living. Certainly
your knowledge portends that.

On Sun, 20 Apr 2008 08:30:34 -0700, "karl mcgruber" skywagon
wrote:


But then, MS Flight Sim probably doesn't ever give you that audio, so
you probably won't hear it after all.
--
Jay (remove dashes for legal email address)


Since "somerset" doesn't appear in the FAA pilot database, I'd be guessing
you're the one playing games while I'm out flying for a living. Certainly
your knowledge portends that.

What makes you think I would EVER use my real name in an email
address? So I'm not surprised you couldn't find the listing under
"somerset". I am there under my real name.

But your name is not in the FAA databases either, either domestic or
foreign. Perhaps you are also using a pseudonym. Or more likely, you
are not a certificated pilot.
--
Jay (remove dashes for legal email address)