I have the Commander Compass (paid version 3.3.6) app on my iPhone 4S. It's an
impressive looking app - says its "Mil Spec" - however I am wonder how accurate
it is. The manual says "The precision of the readings of the built-‐in
hardware sensors affects all of the Spyglass features. Spyglass averages the
input from the sensors over time and uses the basic motion dampening in order
to achieve a better precision." So I guess its down to the accuracy of the
iPhone 4S GPS.
Sitting on my kitchen table it indicates an elevation of between 6893 and 6909
feet. If I average elevation readings over time will I improve the accuracy?
I used the app's Location feature - it overlays an arial photo with crosshairs
of the devices position and it looks to be VERY accurate, I'd say within a few
feet (it has a cross hair over my kitchen an I'm sitting at the kitchen table).
Is the elevation measurement equally accurate.
I also wonder how good this would be for finding true north and aligning Yagi
antennas and rotators. Again, looks pretty accurate and seems to take
declination into account.
Date: Fri, 30 Dec 2011 10:22:10 -0600
From: Richard Thorne <email@example.com>
Subject: Re: [TowerTalk] FAA & Towers, continued
Content-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 its
> value to me here.
> I am filing out FAA form 7460-1 online right now. It asks for the exact
> altitude ASL of my tower(s). How do I find this out? I can extrapolate from
> Google Maps but that won't be accurate to a foot, neither will be my consumer
> grade GPS.
William Hein, AA7XT
(ex-AA4XT, NT1Y, AA6TT, KC6EDP)
AMSAT Life Member
ARRL Life Member
1st W to OH0 QSO on 6m
1st North America to Asia QSO on 60m
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Tel +1 (970) 628-5120
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