[maemo-users] N810 gps troubles

From: Frederic Crozat fred at crozat.net
Date: Mon Mar 31 15:36:36 EEST 2008
On Mon, Mar 31, 2008 at 9:44 AM, Johan Helsingius <julf at julf.com> wrote:
> Had a rather depressing confirmation of the GPS troubles this
>  weekend. Went on a quick trip to London, and turned on the map
>  application as soon as I got on the Heathrow Express heading into
>  town. During the trip, the map application showed the GPS finding
>  3-5 satellites on the average, but it never managed to determine
>  the position. Nor during my walk to the hotel, nor during a
>  walk across St James's park, and not even overnight next to a corner
>  window on 5th floor - it just ran out of charge trying.
>  In the end I got back to Amsterdam without the GPS having acquired
>  a lock during the whole trip. Not very useful.
>  A real bummer, because the 2 main applications I got my 810
>  for was mapping and in-car ODBII, and CarMan doesn't run on
>  the 810... :(
>  Sounds like I should sell my 810 and stick to the 770... :(

Well, GPS on n810 can be extremely frustrating (I had my shares of
trouble with it) when you don't know anything about GPS (like most of
us), because of its low sensitivity.

I suggest you install maemo-mapper, mostly because it give you a
better view of what is happening while GPS fix is in progress
(compared to Maps).

Moreover, if you never had a fix with your n810, the first fix for
your geographical position can be extremely long (more than 12 minutes
since it needs that time to download almanac for your position, this
data is valid several weeks). And if you are moving or in a bad
reception location, it can be very very long.

Once you get the almanac downloaded, fix time can be shorter (5
minutes to 10 minutes in bad conditions). And if you got a fix in the
last 2 hours, you might be able to get a "hot" fix in less than 30s.
If you get a fix, try to stay on the location until you get 8 to 10
satellites, I've noticed it allows faster hotfixes.

Also remember GPS antenna is located under the zoom in/out button, so
try to not hold your n810 with your hand over them (at least for
initial GPS fix).

Frederic Crozat

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