[TowerTalk] Strange behavior

[David Robbins]

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 at arrl.net
web: http://wiki.k1ttt.net
AR-Cluster node: 145.69MHz or telnet://k1ttt.net:7373



-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of Roger
(K8RI) on TT
Sent: Monday, January 23, 2017 03:16
To: towertalk at 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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-- 

73

Roger (K8RI)


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