[TowerTalk] Strange behavior

[Joe Subich, W4TV]

Same with my [old] iPhone 5se.  The app Commander Compass is
outstanding on the IOS platform ... allows the user to select
magnetic or true north and allows overlaying the compass on
the users' choice of maps including maps from Google, Apple
and USGS Topo maps (among others).

73,

    ... Joe, W4TV


On 1/23/2017 1:14 PM, Barry Merrill wrote:
> 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 at contesting.com] On Behalf Of
> Michael Clarson
> Sent: Monday, January 23, 2017 10:33 AM
> To: K1TTT <k1ttt at arrl.net>
> Cc: TowerTalk at 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 at 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 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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>>> TowerTalk mailing list
>>> TowerTalk at contesting.com
>>> http://lists.contesting.com/mailman/listinfo/towertalk
>>
>>
>> --
>>
>> 73
>>
>> Roger (K8RI)
>>
>>
>> ---
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>>
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