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 http://www.orient-lodge.com/node/3884 (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-boun...@maemo.org [mailto:maemo-users-boun...@maemo.org]on Behalf Of Dawid Lorenz Sent: Sunday, February 14, 2010 7:43 AM To: Bernard Tyers Cc: maemo-users@maemo.org Subject: Re: Bad experience with N900 onboard GPS. On 14 February 2010 09:12, Bernard Tyers <b...@runningwithbulls.com> 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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