[Loadstone] Accurate point entry

Shawn Kirkpatrick shawn at odyssey.cm.nu
Sun Jul 1 00:58:35 BST 2007


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
>>>>>
>>>>> _______________________________________________
>>>>> Loadstone mailing list
>>>>> Loadstone at loadstone-gps.com
>>>>> http://www.loadstone-gps.com/mailman/listinfo/loadstone
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> --
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>>>>> 5:57 PM
>>>>>
>>>>>
>>>>
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