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ag2 is offline ag2
2008-02-05 , 08:25
Posts: 164 | Thanked: 132 times | Joined on Dec 2007
#41
The bug most definitely did not exist in 2007. You are probably comparing cold starts from 2007 with warm starts today. Cold starts are still ~3 minutes.
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jussik is offline jussik
2008-02-05 , 09:05
Posts: 139 | Thanked: 24 times | Joined on Sep 2005
#42
Originally Posted by ag2 View Post
My impression is that the gpsd patch helps with "warm" fixes -- i.e. fixes within a couple of hours of a previous fix. Cold fixes still appear to be in the 2+ minute range. My theory on this is that N810 does not keep an almanac, and a cold fix basically involves a full sky scan.
Correct about the almanac, as far as I can tell: gpsdriver just gets a "gps_data_t" (a gpsd data structure) that does not contain ephemeris data.

Originally Posted by cycroft View Post
It must have been a bug in 2007 as well. At least it works now way better than before. In addition to much shorter times for getting a fix the patched version allows you to connect to 6 or 7 sattelites instead of 3-5.
I think you may be mistaken. The bug and the patch should both only have an effect during January and February on leap years.
 
cycroft is offline cycroft
2008-02-05 , 11:57
Posts: 91 | Thanked: 4 times | Joined on Dec 2007
#43
OK. I was wrong. Is there a way to change gpsdriver to save the almanac? That would be easy to implement right? Or does it need to be saved in the GPS chip somwhere?
 
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anidel is offline anidel
2008-02-05 , 12:17
Posts: 1,743 | Thanked: 1,231 times | Joined on Jul 2006 @ Twickenham, UK
#44
Originally Posted by ag2 View Post
The bug most definitely did not exist in 2007. You are probably comparing cold starts from 2007 with warm starts today. Cold starts are still ~3 minutes.
If the bug did not exist in 2007 (as it was not a leap year), then the warm starts of 2007 should be comparable to those of today.

I read people year telling about less than a minute warm start.. that never happens to me.
well, let's say the truth.. it does.. but not so often.

BTW this morning, with no patch, i.e. plain vanilla GPS stuff, I got a fix after say 3-4 minutes. I did not use the GPS for one or two weeks.
 
cycroft is offline cycroft
2008-02-05 , 12:21
Posts: 91 | Thanked: 4 times | Joined on Dec 2007
#45
There are a couple of things you have to distinguish here:

warm start --> ephemeris data still valid should be < 1 min
cold start --> ephemeris dat not valid, but same sattelites reachable 1-5 min
sky search --> gps unit was moved more than several hundreds of kilometers 1-20 min
 
jussik is offline jussik
2008-02-05 , 12:50
Posts: 139 | Thanked: 24 times | Joined on Sep 2005
#46
Interesting. Nokia gpsd maintainer commented on the bug:
The analysis that the leap year bug would affect fix times is wrong. If you are seeing improvements in fix times after patching gpsd, then the reason is something else
Could someone with OS2008 on N810 who hasn't installed my test package check the version of osso-gpsd (apt-cache show osso-gpsd)? The only thing I can think of, outside of mass psychosis, is that N810 does not have the newest gpsd version installed.
 
mwiktowy is offline mwiktowy
2008-02-05 , 13:17
Posts: 373 | Thanked: 56 times | Joined on Dec 2005 @ Ottawa, ON
#47
Originally Posted by jussik View Post
Interesting. Nokia gpsd maintainer commented on the bug:
The analysis that the leap year bug would affect fix times is wrong. If you are seeing improvements in fix times after patching gpsd, then the reason is something else
Could someone with OS2008 on N810 who hasn't installed my test package check the version of osso-gpsd (apt-cache show osso-gpsd)? The only thing I can think of, outside of mass psychosis, is that N810 does not have the newest gpsd version installed.
According to here:
http://tablets-dev.nokia.com/changes...omparison.html

The osso-gpsd version that 2.2007.50-2 had is 1.0-25
 

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PinCushionQueen is offline PinCushionQueen
2008-02-05 , 13:53
Posts: 538 | Thanked: 168 times | Joined on Dec 2007 @ Seattle
#48
My N810 has osso-gpsd version: 1.0-23 (without your package installed)

EDIT: Just to be clear that's with OS2008 v50-2. So evidently the comparison for the OS upgrade is incorrect.
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anidel is offline anidel
2008-02-05 , 14:53
Posts: 1,743 | Thanked: 1,231 times | Joined on Jul 2006 @ Twickenham, UK
#49
Originally Posted by PinCushionQueen View Post
My N810 has osso-gpsd version: 1.0-23 (without your package installed)

EDIT: Just to be clear that's with OS2008 v50-2. So evidently the comparison for the OS upgrade is incorrect.
That's weird indeed!
I have OS2008 v50-2 and I did not update the gpsd and is shows as:

Version: 1.0-25

I have to say that maps was showing an update, but was failing, so I have removed the map application and re-installed it.
Don't know if that threw in also the new gpsd package.

EDIT: typo ("ineed" -> "indeed")
 

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jussik is offline jussik
2008-02-05 , 14:58
Posts: 139 | Thanked: 24 times | Joined on Sep 2005
#50
Originally Posted by PinCushionQueen View Post
My N810 has osso-gpsd version: 1.0-23 (without your package installed)

EDIT: Just to be clear that's with OS2008 v50-2. So evidently the comparison for the OS upgrade is incorrect.
Thanks PinCushionQueen, I think this is the actual solution -- the fix time improvements must have been in 1.0-24 or 1.0-25 and not a result of fixing the leap year bug. I did not notice the difference because I checked the version on my N800 and you guys had no reason to check.

So, up-to-date N800 has osso-gpsd 1.0-25 but N810 has 1.0-23? And upgrading N810 makes it actually work as a GPS? Weird
 
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