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-   -   GPS - Can't get a fix (https://talk.maemo.org/showthread.php?t=23605)

allnameswereout 2008-11-04 16:00

Re: GPS - Can't get a fix
 
LOL I just had the most pathetic thought.

5 PM, ding dong, John Nitwit leaves the building, kindly on a raisin hunting job on request by his wife.

8 PM, John is lost in the cloudy dark.

11 PM, John arrives home, exhausted. "Where have you been", his wife asks. Answer: "It was cloudy"

Anybody up for a comic? :D

bunanson 2008-11-09 19:13

Re: GPS - Can't get a fix
 
Very frustrated with the GPS on the N810. Cannot get a fix no matter what, sticked out to the window, rebooted, turn on a-gps, turn off a-gps, follow the sun, sticked into my mouth, pointed to south,........... fiddling for over 30 minutes, finally we got to the destination, well, one has to stop a car to get out, right? Once the car stopped, it fixed.

I have many BT GPS, 4 of them. I also have many N800, 2 in my possession in the house. I also has a dedicated standalone GPS and a cellphone with google map installed. "Dont bother, honey, I will just take the N810 and save a lot of trouble in carrying all those gadgets.............." That was what I thought. We got lost in a new city for 30 min till we got to where we want to go!

The bottomline, an unreliable instrument is more damaging then NO instrument.

I carefully put my N810 into my drawer, gave it one last glance, albeit a sad one............and now I resume carrying my N800 around.
Dont know whether I should put the N810 to ebay or wait for a fix.

A very upset former N810 user,

bun

maacruz 2008-11-09 20:24

Re: GPS - Can't get a fix
 
This always works for me:
Connect to my wifi, start maemo mapper, wait till it downloads and shows all satellites (about 1 minute), go outside to an more or less open area (far from metal buildings to avoid reflections) while I walk to the garage, wait to get fix watching the satellite signal bars, if 3 bars don't go above 30 move a bit. Usually I get a fix in 1 minute.

fragos 2008-11-09 20:43

Re: GPS - Can't get a fix
 
Quote:

Originally Posted by bunanson (Post 240643)
Very frustrated with the GPS on the N810. Cannot get a fix no matter what, sticked out to the window, rebooted, turn on a-gps, turn off a-gps, follow the sun, sticked into my mouth, pointed to south,........... fiddling for over 30 minutes, finally we got to the destination, well, one has to stop a car to get out, right? Once the car stopped, it fixed.

I have many BT GPS, 4 of them. I also have many N800, 2 in my possession in the house. I also has a dedicated standalone GPS and a cellphone with google map installed. "Dont bother, honey, I will just take the N810 and save a lot of trouble in carrying all those gadgets.............." That was what I thought. We got lost in a new city for 30 min till we got to where we want to go!

The bottomline, an unreliable instrument is more damaging then NO instrument.

I carefully put my N810 into my drawer, gave it one last glance, albeit a sad one............and now I resume carrying my N800 around.
Dont know whether I should put the N810 to ebay or wait for a fix.

A very upset former N810 user,

bun

GPS fixes come faster with the N810 if you have an active Internet connection. The N810 will work with an external BT GPS that you already have.

bunanson 2008-11-10 01:58

Re: GPS - Can't get a fix
 
Quote:

Originally Posted by fragos (Post 240661)
GPS fixes come faster with the N810 if you have an active Internet connection. The N810 will work with an external BT GPS that you already have.

I have active BT internet connection during the whole ordeal. The tablet is tethered to my cell... I just wish I had brought along my BT GPS, as allnameswereout put it, the ONLY solution currently available. The problem is well documented, either Nokia CANNOT fix it (a recall?) or Nokia does NOT want to fix it (model discontinued?)

bun

maacruz 2008-11-11 15:59

Re: GPS - Can't get a fix
 
Quote:

Originally Posted by bunanson (Post 240712)
I have active BT internet connection during the whole ordeal. The tablet is tethered to my cell...

But, after you load maemo-mapper and the gps becomes active, does it show all 10-12 satellites in the gps info panel?
If they show, but you get low signal bars, then it is a hardware problem.
If they do not show, then your internet connection is not working as it should (it can't download the ephemerids).

bunanson 2008-11-11 18:16

Re: GPS - Can't get a fix
 
Quote:

Originally Posted by maacruz (Post 241060)
But, after you load maemo-mapper and the gps becomes active, does it show all 10-12 satellites in the gps info panel?
If they show, but you get low signal bars, then it is a hardware problem.
If they do not show, then your internet connection is not working as it should (it can't download the ephemerids).

After load maemo-mapper, no, it does NOT show any satellites. It takes a long time to catch a few, and then they all disappear, and it then re-start to catch a few, and it disappear again, it keeps on going, but just cant fix.

I am very curious to hear how you point the finger to hardware problem. I am thinking to get it return.

If they do not show, then it is internet connection problem? I think I do not get that. I can browse thru web pages, then suggest internet connection is fine.

I really want to point finger to hardware, although not sure how. And as it happened million times, just when I thought it is hardware, never get a fix, it fixed when I am NOT moving. But man, that is more than 30 min to an hour, sometimes.


bun

allnameswereout 2008-11-11 18:27

Re: GPS - Can't get a fix
 
Don't buy the N810 for the GPS. There are many reasons why its a nice device; why it is preferred over N800. But the GPS isn't one of these reasons. External BlueTooth GPS are cheap these days.

maacruz 2008-11-11 20:34

Re: GPS - Can't get a fix
 
Quote:

Originally Posted by bunanson (Post 241090)
After load maemo-mapper, no, it does NOT show any satellites. It takes a long time to catch a few, and then they all disappear, and it then re-start to catch a few, and it disappear again, it keeps on going, but just cant fix.

I am very curious to hear how you point the finger to hardware problem. I am thinking to get it return.

If they do not show, then it is internet connection problem? I think I do not get that. I can browse thru web pages, then suggest internet connection is fine.

Even if you can browse web pages, that doesn't mean that you aren't blocked from the ephemerids server, by a firewall problem for example, or that agps is not working.
Try using a wifi connection. It doesn't matter if you are inside a building and get no signal, after opening maemo-mapper with a working internet connection, it should download the satellite ephemeris in less than a minute and show about 10 satellites in the info pannel. If that doesn't happen, you have a problem there.
The n810 saves the ephemeris in the file /var/lib/gps/nvd_data, if that file becomes corrupted for whatever reason, you won't get a fix even after 30 mins.
First, delete that file and restart the tablet (shut it down and drop the battery to make a hard reset), then set the clock using ntpdate or rdate (the clock is important to get a quick fix), then connect to internet (using wifi if you can), and start maemo-mapper, then the satellites should appear in the info panel.
If they still do not appear, there is a software problem somewhere (corrupted filesystem maybe, or your internet connection).
If they appear, you can close maemo-mapper and the internet connection if you wish (the data is valid for 30 min); go outside (try to choose a place where you can see as much of the sky as you can), and start maemo-mapper, the same satellites will appear in the info panel, and you should get a fix in about 1-2 min.
If the satellites are in the info panel, but you can't get a fix (the signal bars are small), probably it is a hardware problem.
To check the signal strength go to maemo-mapper menu->gps->details->satellites details. To get a fix at least one satellite should be over 30.

Francisco 2008-11-11 21:14

Re: GPS - Can't get a fix
 
I also have very long time to have a fix with Memo Mapper and a-gps with wi-fi connection. It shows a continuous message
Searching for a GPS receiver
the GPS icon disappears, appears again cyclically and nothing happens.
But
if I launch first Wayfinder it get the satellites signal very fast. Then I launch Maemo Mapper and voilá I have almost instantaneously a fix.
What is wrong with my setup, please?


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