[AT] OT-now GPS

[Dave Rotigel]

Hell Charlie, when my wife drives anything under 9" would be an improvement!
	Dave

On Apr 8, 2015, at 7:45 PM, charlie hill wrote:

> 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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