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phappy
Joined: 11 Mar 2011
Posts: 2
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 Posted: Tue Mar 22, 2011 10:17 am Post subject: Provide GPS position tolerance in meters as CMS variable |
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Hi,
it would be great to have GPS position tolerance (available in compass as +/- value in meters) as a CMS variable available for CMS development. I found this value very useful for tacking, but I did not find a way how to get it in CMS.
Thanks for enhancement or for any hint on this.
BR, Petr
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Ranger
Joined: 12 Dec 2006
Posts: 4721
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JNT
Joined: 10 Jan 2009
Posts: 125
Location: Sweden
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| Posted: Tue Mar 22, 2011 10:50 pm Post subject: |
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Unfortunately this HECL variable (like some others) just returns 0. The good news though, is that it is on the list to be fixed 
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Ranger
Joined: 12 Dec 2006
Posts: 4721
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| Posted: Tue Mar 22, 2011 11:20 pm Post subject: |
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I hope so 
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poutnikl
Joined: 30 Aug 2010
Posts: 173
Location: Czech Republic, Brno
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| Posted: Wed Mar 23, 2011 5:56 am Post subject: |
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I am afraid precision calculations based on xDOP parameters reflects just fixed average estimated error for HDOP=1 (5-6m), multiplied by satellite placement geometry factor given by HDOP.
It does not cover variability of major error in single satellite distance determination (typically 2-7 m), caused by current ionospheric signal delays.
This is eliminated together with other errors by differencial GPS,
going to near 1 cm precision, but it is out of forum scope.
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Nokia E52 (240*320) / Symbian S60 V3 / Last TB relevant to S60 |
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phappy
Joined: 11 Mar 2011
Posts: 2
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| Posted: Thu Mar 24, 2011 7:58 pm Post subject: |
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| Ranger wrote: |
It is possible to count this value from hdop in hecl, like
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Hmm, seems that you are right. Anyway funny is that sometimes I get precision less than 5 this meas hdop < 1 So I hope the CMS variables will start to work so I can use at least this simple way 
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atricault
Joined: 28 Sep 2009
Posts: 47
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| Posted: Fri Mar 25, 2011 10:21 am Post subject: |
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| JNT wrote: |
| The good news though, is that it is on the list to be fixed |
Hi,
How do you know that bug is on the list to be fixed?
In the next version?
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JNT
Joined: 10 Jan 2009
Posts: 125
Location: Sweden
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| Posted: Sat Mar 26, 2011 3:10 pm Post subject: |
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I look on the: "Project tracker" page in the "Backlog" tab. Link is at the top of the page.
Unfortunately not the next version, but at least it is on the list...
Perhaps if it is important for more people, it will be moved up.
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atricault
Joined: 28 Sep 2009
Posts: 47
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| Posted: Mon Mar 28, 2011 8:00 am Post subject: |
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| Ah, thanks. I didn't know this tool exists.
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