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From: Wes Groleau on 2 Apr 2010 22:21
On 04-02-2010 21:23, nospam wrote:
> the compass is separate from the gps

Why does it keep asking permission to use my current location?

> and accelerometer. there are even

What is your hypothesis for the advice to fix the "interference"
by waving the iPhone in a figure eight pattern?

> apps that use it as a metal detector.

Works by magnetism? Why does it claim interference in a wood
frame house with the nearest metal horizontally being nails in
the walls ten feet away and vertically, nails in the sub-floor
three feet below it?

For the purpose of this post, I placed it on a cloth and wood
stool in the center of a room five meters by seven meters.
As I was typing, after almost a minute of not moving, it
stopped alleging interference and the "north" marker pointed
northwest--about 45 degrees off.

I walked over and rotated the iPhone about 90 degrees counter-
clockwise, without lifting it, and with minimal horizontal
translation. The needle rotated with it, and remained pointing
southwest. After sometime, however, it "woke up" and is now
pointing northwest again.

Tune in here later for the results of a different experiment.

:-)

--
Wes Groleau

If you put garbage in a computer nothing comes out but garbage.
But this garbage, having passed through a very expensive machine,
is somehow ennobled and none dare criticize it.
From: nospam on 2 Apr 2010 22:30
In article <hp68n3$nss$1(a)news.eternal-september.org>, Wes Groleau
<Groleau+news(a)FreeShell.org> wrote:

> > the compass is separate from the gps
>
> Why does it keep asking permission to use my current location?

location aware apps ask for permission. it gets annoying, especially if
you answer no and the app starts spewing errors because the location is
invalid.

> > and accelerometer. there are even
>
> What is your hypothesis for the advice to fix the "interference"
> by waving the iPhone in a figure eight pattern?

thats how the compass is calibrated. my garmin gps requires rotating it
360 degrees.

> > apps that use it as a metal detector.
>
> Works by magnetism?

that's how compasses work.

> Why does it claim interference in a wood
> frame house with the nearest metal horizontally being nails in
> the walls ten feet away and vertically, nails in the sub-floor
> three feet below it?

no idea. what does a regular compass do there?
From: Wes Groleau on 2 Apr 2010 22:57
On 04-02-2010 22:30, nospam wrote:
> location aware apps ask for permission. it gets annoying, especially if
> you answer no and the app starts spewing errors because the location is
> invalid.

You suggested it was independent of GPS, which would be inconsistent
with needing location from the GPS.

>> > and accelerometer. there are even
>>
>> What is your hypothesis for the advice to fix the "interference"
>> by waving the iPhone in a figure eight pattern?
>
> thats how the compass is calibrated. my garmin gps requires rotating it
> 360 degrees.

Hmmm, my Garmin GPS (before it died) could only determine direction
by the change in position over time.

>>> apps that use it as a metal detector.
>> Works by magnetism?
> that's how compasses work.

That's how _magnetic_ compasses work. It's not how gyrocompasses
work, and it doesn't appear to be how the iPhone compass works.

>> Why does it claim interference in a wood
>> frame house with the nearest metal horizontally being nails in
>> the walls ten feet away and vertically, nails in the sub-floor
>> three feet below it?
>
> no idea. what does a regular compass do there?

:-) I don't know. After my wife died, my sister cleaned my house
and I haven't seen my "regular compass" since. I'm fairly confident
it wouldn't ask me to wave it in a figure eight. :-)

--
Wes Groleau

Structure and Organization
http://Ideas.Lang-Learn.us/barrett?itemid=1401
From: nospam on 2 Apr 2010 23:03
In article <hp6arf$t2m$1(a)news.eternal-september.org>, Wes Groleau
<Groleau+news(a)FreeShell.org> wrote:

> Hmmm, my Garmin GPS (before it died) could only determine direction
> by the change in position over time.

it can always use movement, but some garmin gps devices have a compass.

> >>> apps that use it as a metal detector.
> >> Works by magnetism?
> > that's how compasses work.
>
> That's how _magnetic_ compasses work. It's not how gyrocompasses
> work, and it doesn't appear to be how the iPhone compass works.

it's a magnetometer.
From: Ian Gregory on 2 Apr 2010 23:47
On 2010-04-03, Wes Groleau <Groleau+news(a)FreeShell.org> wrote:

> What is your hypothesis for the advice to fix the "interference"
> by waving the iPhone in a figure eight pattern?

There is a knowledgebase article about this:

http://support.apple.com/kb/TS2767

In May last year various sources reported that the iPhone would be using
an azimuth sensor (magnetometer) manufactured by the Japanese company
Asahi Kasei:

http://www.iphonefaq.org/archives/97544

Ian

--
Ian Gregory
http://www.zenatode.org.uk/
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