[Loadstone] Built-in GPS

Cearbhall O Meadhra cearbhall.omeadhra at idd.ie
Mon Jun 25 11:18:07 BST 2007


Dear all,
 
I have been asked about the GPS receivers in the latest Nokia phones.
Sighted users say that they are good and work well. Has anyone any
experience of these phones with Talks and loadstone or any other guidance
application?
 

All the best,


Cearbhall

"Good design enables - Bad design disables"

Tel: 01-2864623 Mob: 087 9922227 Em: cearbhall.omeadhra at projectidd.ie




  _____  

From: loadstone-bounces at loadstone-gps.com
[mailto:loadstone-bounces at loadstone-gps.com] On Behalf Of Rob Melchers
Sent: 24 June 2007 18:55
To: loadstone at loadstone-gps.com
Subject: Re: [Loadstone] MTK chipset, was Re: royaltek rbt 2110


Hallo Jurg,

When using programs like Wayfinder or Trekker this software wants to put you
in a street, not on top of a building. If you're put in the wrong street,
the faulty reading is as faulty as the distance between the street you are
in and the street the software thinks you are in. So, if these streets are
seperated by 40 meters, you're off by 40 meters, even though your receiver
may not be more off than 15 meters. When using Loadstone I do not experience
faults bigger than 20 meters in urban canyons and I'm afraid that's what we
have to live with using GPS as an orientational tool. In the area I live in
(a mix of low and high buildings seperated by open areas) accuracy usually
is between 10 and 15 meters. In good conditions this can improve to between
5 and 10 meters, but that's about it. Again I would like to warn for
receivers that use averaging models and 'improvements after reception'. So
far these improvements have had no influence on the kind of accuracy we are
looking for.

Rob

At 6/24/2007, you wrote:


Content-class: urn:content-classes:message
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hi Rob,
; In theory, MPR is responsible for a plus minus 3 meters degradation of
accuracy
is this what you see in practice as well?
I'd would say accuracy is degradated up to 40 meters in practice.
I made some testing with another software which announces me in realtime on
which street i am.
Sometimes, on the same street, it gives me a parallel street in about 40
meters, but as this happens not all the time, it cannot be a problem of map.
Hence, i'd say it's a problem of reflexions.
Jürg
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