[Loadstone] Saving accurate point coordinates.

Kevin Chao g.unit89 at clearwire.net
Thu Jul 19 07:09:48 BST 2007


The Holux M-1000 with the MTK chipset. I wouldn't recommend using receivers 
that utalize the MTK chipset as many of them have serious issues with speeds 
below 4 KMH. So, use at your own risk.

Kevin

----- Original Message ----- 
From: "Len Burns" <len at gatamundo.com>
To: <loadstone at loadstone-gps.com>
Sent: Wednesday, July 18, 2007 10:50 PM
Subject: Re: [Loadstone] Saving accurate point coordinates.


> Interesting, which receiver are you currently using?
>
> -L
> On Wed, 18 Jul 2007, Kevin Chao wrote:
>
>> The ability to receive the waas signal greatly depends on the particular
>> receiver that one is using. Although there is a small portion that 
>> depends
>> on the area, but I have received waas with a very high frequency with the
>> reciever I am currently using, about 90% of the time. This is in contrast 
>> to
>> the receivers I used in the past, with them receiving waas about 50% and 
>> the
>> other 10% of the time respectively. As newer and more improved chipsets 
>> are
>> produced, the frequency of the ability to receive the waas signal will 
>> also
>> increase.
>>
>> Kevin
>>
>> ----- Original Message -----
>> From: "Len Burns" <len at gatamundo.com>
>> To: <loadstone at loadstone-gps.com>
>> Sent: Wednesday, July 18, 2007 10:10 PM
>> Subject: Re: [Loadstone] Saving accurate point coordinates.
>>
>>
>>> Nor have I in South San Francisco Bay area, California, Los Angeles,
>>> Chicago nor New York City.
>>>
>>> -Len
>>> On Thu, 19 Jul 2007, Jim Ruby wrote:
>>>
>>>> I have never seen waas enabled and I have traveled in Minnesota, south
>>>> Dakota, Wisconsin, ilinois, Indiana and ohio. And I do have it set to 
>>>> on
>>>> in
>>>> the settings.
>>>>
>>>> I wonder where this is mainly used.
>>>>
>>>>
>>>>
>>>>
>>>> -----Original Message-----
>>>> From: loadstone-bounces at loadstone-gps.com
>>>> [mailto:loadstone-bounces at loadstone-gps.com] On Behalf Of Shawn
>>>> Kirkpatrick
>>>> Sent: Wednesday, July 18, 2007 11:23 PM
>>>> To: loadstone at loadstone-gps.com
>>>> Subject: Re: [Loadstone] Saving accurate point coordinates.
>>>>
>>>> You may have waas enabled but might not be getting it anyway. On my
>>>> royaltek
>>>>
>>>> I've never seen it get a waas signal. You can check this by checking 
>>>> the
>>>> gps
>>>>
>>>> quality, if it says differencial fix then you have waas, if not then 
>>>> you
>>>> have standard gps. The accuracy for standard gps is around 15 meters. 
>>>> If
>>>> your points are within that then things are ok. You can make manual
>>>> adjustments to the coordinates with the point update window. The 
>>>> problem
>>>> there is you wouldn't know what the "accurate" value should be. Every
>>>> time
>>>> you were on the point the gps receiver could give different 
>>>> coordinates.
>>>> So
>>>> a correction that seemed to work one day could be completely inaccurate
>>>> the
>>>> next. No matter how accurate the point coordinates are you still have 
>>>> the
>>>> gps drift to deal with. In the worst case those two inaccuracies add
>>>> together to create a bad result but in practice this doesn't seem to
>>>> happen
>>>> too often.
>>>> I guess the real solution to this is to wait for better quality 
>>>> consumer
>>>> receivers to come out or get your hands on some military-grade 
>>>> hardware.
>>>>
>>>> On Wed, 18 Jul 2007, Dave Mielke wrote:
>>>>
>>>>> [quoted lines by Shawn Kirkpatrick on 2007/07/18 at 17:30 -0700]
>>>>>
>>>>>> What you're experiencing is gps drift and it's to be expected.
>>>>>
>>>>> Yes, I understand this.
>>>>>
>>>>>> If your is waas capable this drift can go down quite a bit when
>>>>>> standing
>>>> still
>>>>>> but will still be there.
>>>>>
>>>>> It is, and I always leave it on.
>>>>>
>>>>>> We've considered putting in some sort of averaging
>>>>>> but you'd have to be standing still for some period of time for it to
>>>> work.
>>>>>
>>>>> Wel;l, in this case I was sitting, but I understand what you're 
>>>>> saying.
>>>>>
>>>>>> Even then it would only be an average so still not quite accurate.
>>>>>
>>>>> However inaccurate it may remain, it'd surely be better than an
>>>> instantaneous
>>>>> single capture which just might be way off.
>>>>>
>>>>> Another approach mightr be for the user to be able to move a point by 
>>>>> an
>>>> amount
>>>>> in a direction. That way, he could make an imperical judgement based 
>>>>> on
>>>> several
>>>>> measurements and then make manual adjustments.
>>>>>
>>>>> --
>>>>> Dave Mielke           | 2213 Fox Crescent | I believe that the Bible 
>>>>> is
>>>> the
>>>>> Phone: 1-613-726-0014 | Ottawa, Ontario   | Word of God. Please 
>>>>> contact
>>>>> me
>>>>> EMail: dave at mielke.cc | Canada  K2A 1H7   | if you're concerned about
>>>> Hell.
>>>>> http://FamilyRadio.com/                   | http://Mielke.cc/bible/
>>>>> _______________________________________________
>>>>> Loadstone mailing list
>>>>> Loadstone at loadstone-gps.com
>>>>> http://www.loadstone-gps.com/mailman/listinfo/loadstone
>>>>>
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>>>
>>> --
>>>
>>> "Do not go where the path may lead, go instead where there is no path
>>> and leave a trail."
>>> ~ Ralph Waldo Emerson ~
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>>>
>>
>>
>>
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>
> --
>
> "Do not go where the path may lead, go instead where there is no path
> and leave a trail."
> ~ Ralph Waldo Emerson ~
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