[OSM-talk] DGPS on GPRS?

[Andy Robinson]

I'd agree that DGPS is probably not worth it within OSM. However SBAS over
the Internet is a different matter and I think what the original interest
was about. Subject perhaps should be SBAS on GPRS

Andy

Andy Robinson
Andy_J_Robinson at blueyonder.co.uk 

>-----Original Message-----
>From: talk-bounces at openstreetmap.org [mailto:talk-
>bounces at openstreetmap.org] On Behalf Of Erik Johansson
>Sent: 06 September 2006 12:32 PM
>To: Nigel Magnay
>Cc: talk at openstreetmap.org
>Subject: Re: [OSM-talk] DGPS on GPRS?
>
>On 9/6/06, Nigel Magnay <nigel.magnay at gmail.com> wrote:
>> It struck me someone on this list might know.
>>
>> I currently collect trackpoints with a Windows Mobile phone & a tomtom
>gps
>> with some simple software. I note there's a few systems for sending
>> differential correction signals to improve the accuracy of the fix.
>>
>> Are any of these available over the internet? My phone has a fairly GPRS
>> connection, and it would seem obvious to me to have the corrections
>> available as a web service or similar. Is there such a service ?
>
>I've decided for my self that DGPS isn't very usefull, I might be
>wrong. But I base it on this:
>
>0. DGPS was big when the GPS signal was still scrambled, but not now.
>1. it's pretty hard to setup
>2. you don't really need it
>3. the gain is very small if you don't have and expensive GPS, and
>want a fix within 2cm..
>
>--
>/Erik
>
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