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Re: [TowerTalk] Strange behavior

To: "'Michael Clarson'" <wv2zow@gmail.com>, "'K1TTT'" <k1ttt@arrl.net>
Subject: Re: [TowerTalk] Strange behavior
From: "Barry Merrill" <w5gn@mxg.com>
Date: Mon, 23 Jan 2017 12:14:28 -0600
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
My iPhone 7 does NOT need motion for the Compass App.
The app immediately rotates to the heading of the phone, 
while the phone was flat on the desk.

Barry, W5GN



-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of
Michael Clarson
Sent: Monday, January 23, 2017 10:33 AM
To: K1TTT <k1ttt@arrl.net>
Cc: TowerTalk@contesting.com
Subject: Re: [TowerTalk] Strange behavior

David's method of using a topo map and sighting an object is the best way.
A GPS requires it to move in order to get a bearing, and magnetic compasses
have issues. Besides the difference between magnetic and true north, they
are often affected by local conditions. I have encountered errors up to 40
degrees in the mountains between Bethlehem and Harrisburg PA, probably due
to all the iron ore in the ground. --Mike, WV2ZOW

On Mon, Jan 23, 2017 at 7:23 AM, David Robbins <k1ttt@verizon.net> wrote:

> Compasses in smartphones are like the ones in your car, a magnetic sensor.
> So they are affected the same way as any other magnetic compass.
>
> A gps can only tell you what direction you are moving and can take 
> quite a while to give a good bearing especially in cluttered 
> environments around buildings or even heavily wooded areas.  The best 
> way to get a bearing with a gps is to mark a waypoint at the tower, 
> preferably by averaging the location for a minute or two if your gps 
> supports that, then going at least
> 100 yards away in the general direction you want to check... when you 
> get a good distance away check the bearing back to the original 
> waypoint which is of course the reciprocal of where the antenna is
pointing.
>
> My preferred method is to find an obvious feature on a map that you 
> can see from the tower and get the bearing to it from a good map then 
> use that to line up rotors.
>
> David Robbins K1TTT
> e-mail: mailto:k1ttt@arrl.net
> web: http://wiki.k1ttt.net
> AR-Cluster node: 145.69MHz or telnet://k1ttt.net:7373
>
>
>
> -----Original Message-----
> From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of 
> Roger
> (K8RI) on TT
> Sent: Monday, January 23, 2017 03:16
> To: towertalk@contesting.com
> Subject: Re: [TowerTalk] Strange behavior
>
> If I'm not mistaken the smart phones derive the compass from GPS which 
> is true, not magnetic so it wouldn't require a correction.
>
> 73,  Roger (K8RI)
>
> On 1/22/2017 8:43 PM, Jim Brown wrote:
> > Thanks Dick.  It's also important to realize that accuracy will 
> > depend on the sensors in the phone it's running on, as well as 
> > surrounding stuff as others have noted.
> >
> > I bought an unlocked Motorola Moto X Pure phone last fall that I 
> > like it lot. I have two compass programs on it that SEEM to work 
> > well. GPS Status and Compass 360. Both automatically correct for 
> > declination. I haven't done a serious test of either of them. The 
> > one you recommend also looks good.
> >
> > 73, Jim K9YC
> >
> > On Sun,1/22/2017 5:21 PM, Richard Solomon wrote:
> >> OK, I'll be a bit more specific.
> >> There's an App called GPS Essentials.
> >> No Owls, no bugs, has a very accurate compass.
> >
> > _______________________________________________
> >
> >
> >
> > _______________________________________________
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> > TowerTalk@contesting.com
> > http://lists.contesting.com/mailman/listinfo/towertalk
>
>
> --
>
> 73
>
> Roger (K8RI)
>
>
> ---
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