In the Northern hemisphere, put a small stake in the ground and mark the end
of the shadow,
wait a few minutes and mark the end of the shadow again, the put your left
foot on the first
mark and the right foot on the second mark and you will be facing north. You
similar with tower shadow but getting your feet on the marks might be tough.
73, Larry W6NWS
----- Original Message -----
To: <firstname.lastname@example.org>; <email@example.com>
Sent: Tuesday, January 03, 2012 7:16 PM
Subject: Re: [TowerTalk] How accurate are iPhone Compass apps?
> No hi-tech required, during a sunny day when your tower's shadow is the
> shortest it will be pointing North. If you want to get fancy just input
> your Lat. Lon.
> Into this program and you will have your local solar noon -- your tower's
> shadow will be pointing North at that time.
> If you paint a stripe on your roof where the shadow points or add a rock
> in the yard etc. you'll have a nice reminder which way north is -- Google
> earth works just fine too --- tools/ruler/line!
> Regards, John NA6L
> -----Original Message-----
> From: William Hein <firstname.lastname@example.org>
> To: towertalk <email@example.com>
> Sent: Fri, Dec 30, 2011 10:43 am
> Subject: [TowerTalk] How accurate are iPhone Compass apps?
> I have the Commander Compass (paid version 3.3.6) app on my iPhone 4S.
> It's an
> mpressive looking app - says its "Mil Spec" - however I am wonder how
> t is. The manual says "The precision of the readings of the built-‐in
> ardware sensors affects all of the Spyglass features. Spyglass averages
> nput from the sensors over time and uses the basic motion dampening in
> order to
> chieve a better precision." So I guess its down to the accuracy of the
> S GPS.
> Sitting on my kitchen table it indicates an elevation of between 6893 and
> eet. If I average elevation readings over time will I improve the
> accuracy? I
> sed the app's Location feature - it overlays an arial photo with
> crosshairs of
> he devices position and it looks to be VERY accurate, I'd say within a few
> it has a cross hair over my kitchen an I'm sitting at the kitchen table).
> he elevation measurement equally accurate.
> I also wonder how good this would be for finding true north and aligning
> ntennas and rotators. Again, looks pretty accurate and seems to take
> eclination into account.
> ill AA7XT
> Date: Fri, 30 Dec 2011 10:22:10 -0600
> rom: Richard Thorne <firstname.lastname@example.org>
> ubject: Re: [TowerTalk] FAA & Towers, continued
> o: email@example.com
> essage-ID: <4EFDE532.firstname.lastname@example.org>
> ontent-Type: text/plain; charset=ISO-8859-1; format=flowed
> My new iPhone 4S has a compass application with GPS coordinates.
> Rich - N5ZC
> On 12/30/2011 8:51 AM, William Hein wrote:
> Thanks for all for the great advice and info! TowerTalk really proving
> alue to me here.
> I am filing out FAA form 7460-1 online right now. It asks for the exact
> ltitude ASL of my tower(s). How do I find this out? I can extrapolate
> oogle Maps but that won't be accurate to a foot, neither will be my
> rade GPS.
> illiam Hein, AA7XT
> ex-AA4XT, NT1Y, AA6TT, KC6EDP)
> AMSAT Life Member
> RRL Life Member
> KSMG Member
> 1st W to OH0 QSO on 6m
> st North America to Asia QSO on 60m
> ounder of TopBand email reflector
> Tel +1 (970) 628-5120
> mail Bill.AA7XT@Gmail.com
> oc: DM59pa
> eb AA7XT.com
> eb twitter.com/williamhein
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