Based
on the documentation of the GPS software, the GPS can run in four different
modes,
Complementary Wireless Positioning (CWP) - This is based on the location
of the country and/or the GSM base station location. It does not use the
onboard GPS at all, but depends on the SIM card.
Assisted
Complementary Wireless Positioning (ACWP) - This is similar to CWP but
requires a network connection to get better information about the GSM base
station location
Global Navigation Satellite System (GNSS) - This uses
the GPS receiver. It does not require a network connection or a SIM
card.
Assisted Global Navigation
Satellite System (AGNSS) - This uses the GPS receiver, but gets additional
information from a SIM card or Network connection. It works basically the
same as GNSS, but since it starts with a good guess at the location is often
faster on startup than GNSS.
I had a little fun writing
some software for the N900 to track a drive I took a while ago. All of the
data was extracted using AGNSS and saved to a file which I loaded into Google
Maps. You can see the map of my trip, as well as read about the
programming I did at
#N900 - My New
Gps
(The link to liblocation in
the blog post is where you can also read more information about the various GPS
modes)
Aldon
-----Original Message-----
From: maemo-users-bounces@xxxxxxxxx [mailto:maemo-users-bounces@xxxxxxxxx]On Behalf Of Dawid Lorenz
Sent: Sunday, February 14, 2010 7:43 AM
To: Bernard Tyers
Cc: maemo-users@xxxxxxxxx
Subject: Re: Bad experience with N900 onboard GPS.
On 14 February 2010 09:12, Bernard Tyers <b@xxxxxxxxxxxxxxxxxxxx> wrote:
No, I don't have a connection to the Internet when using Ovi Maps-thats the exact reason why I use Ovi Maps.
You shouldn't be expected to use a network connection with an onboard GPS.
True, but afaik N900 has A-GPS onboard, which is assisted by supplementary GPS data downloaded via internet. Without that connection it probably sucks badly, as you could experience. I am no expert on GPS, but that's how I understand A-GPS chipsets are working.
--
Dawid 'evad' Lorenz * http://adl.pl
null://I would love to change the world, but they won't give me the source code
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