[Loadstone] Accurate point entry

David Allen wd8ldy at xtra.co.nz
Sun Jul 1 01:18:45 BST 2007


Hi Shawn and list!

+12:30 is the highest. If I ever need to go out to the Chathams, I'll need 
that offset.

Cheers,
Dave
----- Original Message ----- 
From: "Shawn Kirkpatrick" <shawn at odyssey.cm.nu>
To: <loadstone at loadstone-gps.com>
Sent: Sunday, July 01, 2007 11:58 AM
Subject: Re: [Loadstone] Accurate point entry


> Yeah, the +12:30 offset could be added to the list. I didn't think there
> were any time zones after +12:00. Anyone know how high this can go?
>
> On Sun, 1 Jul 2007, David Allen wrote:
>
>> Hi Shawn and list!
>>
>> Many thanks for the explanation of accuracy. Now I do have a much better
>> understanding of it.
>>
>> Checked out the geocoder yesterday as well. It even has NZ information 
>> which
>> will be handy for planning.
>>
>> The time offset feature is nice to keep time synced with GPS. Buyt I 
>> could
>> not find +12:30 in the list. Can that be considered for the next version?
>>
>> Cheers,
>> Dave
>> ----- Original Message -----
>> From: "Shawn Kirkpatrick" <shawn at odyssey.cm.nu>
>> To: <loadstone at loadstone-gps.com>
>> Sent: Saturday, June 30, 2007 11:50 PM
>> Subject: Re: [Loadstone] Accurate point entry
>>
>>
>>> You want a low accuracy value if possible. The lower the better. It's an
>>> approximation of how accurate your gps receiver thinks the information
>>> it's
>>> giving is. If you multiply this number by 8 you should get the accuracy 
>>> in
>>> meters. This will probably be in the next version of loadstone so this
>>> will
>>> mean something useful.
>>> Standard gps accuracy is around 15 meters. Sometimes it's better and
>>> sometimes it's worse but around the 15 meter range is normal.
>>> A lot of other factors will effect this thoe. Your receiver, weather
>>> conditions, reflections, etc.
>>>
>>> On Sat, 30 Jun 2007, David Allen wrote:
>>>
>>>> Hi Brett and list!
>>>>
>>>> Thanks for the info. Yes, you've opened up something that I've wondered
>>>> about. - this accuracy reading. I've checked that a lot but didn't
>>>> understand (and not sure I do yet) what it means. The other day, I had 
>>>> a
>>>> result of something like 50 when I pressed accuracy. Usually, it is
>>>> between
>>>> 1 something and 3 something.
>>>>
>>>> I have turned off power saving and my points that i've played with 
>>>> today
>>>> do
>>>> seem a bit closer than they were previously. But this drift thing is
>>>> definitely something to keep in mind. Maybe I chose the wrong receiver,
>>>> but
>>>> since I do a fair amount of travelling in various cars, the comments
>>>> about
>>>> that in the FAQ were my deciding guide, besides local availability and
>>>> affordability, of course. While heading seems to change even though I
>>>> haven't changed my direction, I still believe it isn't as wrong as the
>>>> Robotron talking compass which I returned after a week. That thing was
>>>> hopeless, at least in New Zealand. I said it guessed a direction each
>>>> time
>>>> you pushed the button and gave you an answer, whether it meant anything
>>>> or
>>>> not.
>>>>
>>>> Cheers,
>>>> Dave
>>>>
>>>> of course
>>>> ----- Original Message -----
>>>> From: "Brett" <brett06 at tpg.com.au>
>>>> To: <loadstone at loadstone-gps.com>
>>>> Sent: Saturday, June 30, 2007 6:01 PM
>>>> Subject: Re: [Loadstone] Accurate point entry
>>>>
>>>>
>>>>> Hi David,
>>>>>
>>>>> I find you get more accurate positioning if once you have established 
>>>>> a
>>>>> connection with your GPS receiver, go in to the GPS menu of Loadstone
>>>>> and
>>>>> turn off "power saving". This seems to cause my receiver to get 
>>>>> stronger
>>>>> reception. Also when checking the accuracy of your points, try to do
>>>>> them
>>>>> when moving. The SIRF3 chipsets do have quite a bit of drift when
>>>>> standing
>>>>> still, so it could be that the drift is causing your point to seem in
>>>>> accurate. If I walk past my local bus stop and check the accuracy of 
>>>>> my
>>>>> point, it is usually with in 3 to 4 meters. But when I check it while
>>>>> standing still at the bus stop, it can be anywhere from 3 to 15 
>>>>> meters,
>>>>> because of the drift in the Sirf3 chipset when standing still. You 
>>>>> need
>>>>> to
>>>>> keep this in mind when evaluating the accuracy of your points.
>>>>>
>>>>> Hope this helps,
>>>>> Brett.
>>>>>
>>>>>
>>>>> ----- Original Message -----
>>>>> From: "David Allen" <wd8ldy at xtra.co.nz>
>>>>> To: <loadstone at loadstone-gps.com>
>>>>> Sent: Saturday, June 30, 2007 1:29 PM
>>>>> Subject: [Loadstone] Accurate point entry
>>>>>
>>>>>
>>>>>> Hi list!
>>>>>>
>>>>>> Well this is probably a beginner's question, too, but I know everyone
>>>>>> was
>>>>>> a
>>>>>> beginner sometime.
>>>>>>
>>>>>> I understand that positions marked inside wouldn't be accurate. I 
>>>>>> also
>>>>>> understand that entering points while stationary isn't useful. But
>>>>>> here's
>>>>>> the thing. I've tried entering points outside while in motion and 
>>>>>> these
>>>>>> don't seem to be any more accurate than  the inside ones. How can I
>>>>>> improve
>>>>>> on this? I recently was at a place where I entered a point yesterday.
>>>>>> Loadstone told me that the point was 12 Metres away at 12 o'clock. 
>>>>>> Now
>>>>>> I
>>>>>> know exactly where I was.
>>>>>>
>>>>>> I suspect the number of sattelites that are visible can be a factor 
>>>>>> in
>>>>>> making your position more accurate as well. Is there a way of 
>>>>>> improving
>>>>>> on
>>>>>> that? I know that buildings can corrupt signals, so how far must you 
>>>>>> be
>>>>>> from
>>>>>> a building to keep it from distorting your reception? Can a fence 
>>>>>> cause
>>>>>> a
>>>>>> problem? For example, one of the points I entered is very near a 
>>>>>> fence
>>>>>> and
>>>>>> it is taller than I am. Oh, the pains of being short. But anyway, 
>>>>>> these
>>>>>> are
>>>>>> the things that I'm wondering as I begin to develop my own ideas 
>>>>>> about
>>>>>> entering points.
>>>>>>
>>>>>> I wish there was a way of changing the measurements used. I can
>>>>>> appreciuate
>>>>>> that I live in a metric country so everything here is in metres. But 
>>>>>> I
>>>>>> find
>>>>>> it harder to reconcile the distances mentioned in my mind. After all,
>>>>>> since
>>>>>> this is a personal thing we're doing for ourselves by entering 
>>>>>> points,
>>>>>> shouldn't we have measurements that make sense to us? Maybe this
>>>>>> functionality is already there, and I've missed it. If it isn't,
>>>>>> perhaps
>>>>>> it
>>>>>> could be looked at.
>>>>>>
>>>>>>
>>>>>>
>>>>>> Cheers,
>>>>>> Dave
>>>>>>
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>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> --
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>>>>>>
>>>>>>
>>>>>
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