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Compass

 
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tdawson-townsend(at)auror
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PostPosted: Sat Dec 29, 2007 11:19 am    Post subject: Compass Reply with quote

bobf wrote:
“Secondly - most of us use our GPS to set our DG anyway - not the compass.”

Let’s not get track (what a GPS gives you) confused with heading (what your compass gives you). We’ve all seen those cross wind days where track and heading differ by 30 degrees. That’s the beauty of the EFIS systems that compare magnetic-driven heading (your magnetometer being essentially a compass) to GPS track, then do the math, and tell you the wind magnitude and direction.

TDT


Tim Dawson-Townsend
tdt(at)aurora.aero (tdt(at)aurora.aero)
617-500-4812 (office)
617-905-4800 (mobile)

[quote][b]


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larry(at)macsmachine.com
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PostPosted: Sat Dec 29, 2007 1:40 pm    Post subject: Compass Reply with quote

Hi guys,
I hope this isn't an argument for discarding the compass in lieu of the
GPS. I've already been in white-out conditions and the GPS indicating
its batteries were
failing. The compass got me back, not a great distance, but good enough
for the mere 20 miles from home. Makes no sense to not have a good
working compass
on board and one in your emergency bag too.

Larry McFarland 601HDS at www.macsmachine.com
Dawson-Townsend,Timothy wrote:
Quote:

bobf wrote:

“Secondly - most of us use our GPS to set our DG anyway - not the
compass.”

Let’s not get track (what a GPS gives you) confused with heading (what
your compass gives you). We’ve all seen those cross wind days where
track and heading differ by 30 degrees. That’s the beauty of the EFIS
systems that compare magnetic-driven heading (your magnetometer being
essentially a compass) to GPS track, then do the math, and tell you
the wind magnitude and direction.

TDT

Tim Dawson-Townsend

tdt(at)aurora.aero <mailto:tdt(at)aurora.aero>

617-500-4812 (office)

617-905-4800 (mobile)

*

*


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bobf(at)feldtman.com
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PostPosted: Sat Dec 29, 2007 7:04 pm    Post subject: Compass Reply with quote

Very true! and also all that magnetic deviation that changes yearly...That
is why I do have the whiskey compass in the plane

bobf

On 12/29/07, Dawson-Townsend,Timothy <tdawson-townsend(at)aurora.aero> wrote:
[quote]
bobf wrote:

"Secondly - most of us use our GPS to set our DG anyway - not the compass


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bicyclop(at)pacbell.net
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PostPosted: Sat Dec 29, 2007 9:59 pm    Post subject: Compass Reply with quote

You can, in fact, set your DG accurately with a GPS while taxiing. Sure it will precess, but by that time you've got a pretty good idea if the winds aloft are a factor. Better yet - throw the DG away and get an EFIS with a remote magnetometer.

Pax,

Ed Holyoke


[quote] On 12/29/07, Dawson-Townsend,Timothy <tdawson-townsend(at)aurora.aero (tdawson-townsend(at)aurora.aero)> wrote:
Quote:


bobf wrote:
"Secondly - most of us use our GPS to set our DG anyway - not the compass."

Let's not get track (what a GPS gives you) confused with heading (what your compass gives you). We've all seen those cross wind days where track and heading differ by 30 degrees. That's the beauty of the EFIS systems that compare magnetic-driven heading (your magnetometer being essentially a compass) to GPS track, then do the math, and tell you the wind magnitude and direction.

TDT


Tim Dawson-Townsend
tdt(at)aurora.aero (tdt(at)aurora.aero)
617-500-4812 (office)


[b]


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MauleDriver(at)nc.rr.com
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PostPosted: Wed Jan 02, 2008 6:01 pm    Post subject: Compass Reply with quote

Well, as a data point, I just finished a flight where that would not have worked at all. The winds were too high, the flight too long, and the precessing was worse than usual (I think) due to lee wave conditions. 5b2 to 8nc8 1/2/07.

It occurs to me that like many things in aviation, there are time tested reasons for the basic procedure. Modifying them should be done with excess caution.

Can't wait to get to the remote magnetometer.

Bill Watson

Ed wrote: [quote] You can, in fact, set your DG accurately with a GPS while taxiing. Sure it will precess, but by that time you've got a pretty good idea if the winds aloft are a factor. Better yet - throw the DG away and get an EFIS with a remote magnetometer.

Pax,

Ed Holyoke


Quote:
On 12/29/07, Dawson-Townsend,Timothy <tdawson-townsend(at)aurora.aero (tdawson-townsend(at)aurora.aero)> wrote:
Quote:


bobf wrote:
"Secondly - most of us use our GPS to set our DG anyway - not the compass."

Let's not get track (what a GPS gives you) confused with heading (what your compass gives you). We've all seen those cross wind days where track and heading differ by 30 degrees. That's the beauty of the EFIS systems that compare magnetic-driven heading (your magnetometer being essentially a compass) to GPS track, then do the math, and tell you the wind magnitude and direction.

TDT


Tim Dawson-Townsend
tdt(at)aurora.aero (tdt(at)aurora.aero)
617-500-4812 (office)




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