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Re: [TowerTalk] And now for something completely different(TrueNorth)

To: Joe - WDØM <>,<>
Subject: Re: [TowerTalk] And now for something completely different(TrueNorth)
From: Jim Lux <>
Date: Mon, 28 Aug 2006 09:51:21 -0700
List-post: <>
At 07:34 AM 8/28/2006, Joe - WDØM wrote:
>I use my GPS receiver.  Walk from the tower base
>to what you believe is close to true north, then
>check your return path - it should be 180
>degrees.  If not, then repeat the process until
>you find it.  Before returning to the tower base,
>place an object at the furthest north point so
>you can use it to align your antenna.

There are some subtleties with GPS.. particularly if there's things around 
that can cause multipath.  The typical probable error circle is going to be 
in the few meters range, so, to get 1 degree accuracy, the two points 
measured with GPS need to be 100 meters or so apart.  Most receivers these 
days give you an estimated position error to help with figuring out how far 
you need to walk.

Also, be aware that the different grids and datums do not always have north 
aligned at all points (it's that flat map on round earth thing..)

Again, these are for subtle (sub degree) kinds of precision. If all you're 
doing is pointing your antenna within 5-10 degrees, then lots of things 
will work, well enough.

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