[AT] OT-now GPS

[charlie hill]

I think Google, Mercedes and Audi are using GPS  to drive cars these
days.  How accurate does that have to be?

Charlie

-----Original Message----- 
From: Ralph Goff
Sent: Wednesday, April 08, 2015 9:48 AM
To: Antique tractor email discussion group
Subject: Re: [AT] OT-now GPS

On 4/8/2015 5:05 AM, Henry Miller wrote:
> The laws of physics prevent the satellite only systems from getting more 
> accurate than about 16 feet. You know how on a hot day things sometimes 
> get wavy off in the distance? Same thing happens to satellite signals, and 
> the satellite is much farther away than those hazy things.
>
>   Throw in something on the ground and you can get much closer.
>
> Disclaimer, I work for John Deere on the 4600 displays. I'm not speaking 
> for them though.
>
16 feet? I would have to question that law. I use my trimble ezee guide
running off the free satellites for seeding crops every spring now. It
is a 28 foot wide seeder and I can easily check the accuracy just by
looking over my shoulder at the ground , then glancing at the screen.
Seems like they match up the lines pretty well. The only misses I see in
the field are where I fall asleep and wander off the line :-)
I even use it as an acreage counter since the mechanical counter quit on
the air seeder unit. I find it to be quite accurate. Maybe not the sub
inch accuracy of the rtk systems but plenty good enough for me.

Ralph in Sask.

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