[Galaxy S I9000 General] betoNL:
Before posting let's do some homework:

Startup

When you switch the GPS on, the time-to-first-fix varies depending on how long it is since you last used the GPS. To get a fix, the GPS receiver needs a valid almanac, initial location, time, and ephemeris data.

The terms "cold/warm/hot start" indicate how many of these pieces of data the GPS receiver already has. The terms mean different things to different GPS manufacturers.

Cold start - if the GPS not been used for a long time and/or has moved several hundred kilometres it will take some time to get the first fix. In this state, the GPS receiver does not have a current almanac, ephemeris, initial position or time. Older GPS units may take up to an hour to search for satellites, download the almanac and ephemeris data and obtain an initial position, though newer GPS units may require much less than this.

If the GPS receiver has moved several hundred kilometres, its assumptions about which satellites to use will be incorrect and it will have to search for them. Most units will let you enter an approximate location to speed the process.

Warm start - current almanac, initial position, and time are all valid. Ephemeris data is either invalid or only partially valid. Time-to-first-fix is likely to be 30 seconds to 2 minutes depending on satellite availability and the type of GPS receiver.

Hot start - if the receiver has been off for, say, less than an hour time-to-first-fix will likely be 5-20 seconds.

What does this all mean in practice?

If the GPS has been recently used you should get a fix almost immediately. If it hasn't, put the GPS outside with a clear view of the sky and have a cup of tea.

If you have a GPS in a vehicle, it's better to wait for the unit to get a fix before driving off. Receiving ephemeris data for a satellite takes 30 seconds. If you momentarily interrupt the signal during that time the GPS it could take up to a minute more to get the ephemeris for that satellite as it has to start over. If you drive in an area with tall buildings or other obstructions it may take a long time to get the ephemeris data, for four satellites, that is needed for the first fix

So many of you are saying that you GS is getting a fix after a cold start in around a minute with wireless networks UNchecked!!

It means that your GS got a better gps chipset that SirfstarIII

I dont know whats better your GS or the drugs you guys are taking:eek:

Lesson 2:

A-GPS

Assisted GPS (A-GPS) is a way of improving the time to first fix, or even allowing a fix in conditions where the GPS might not otherwise be able to function.

The A-GPS device will use a data connection (e.g. 3G on a cellphone) to contact an assistance server. The server can supply almanac and ephemeris data so the GPS doesn't have to wait to receive them from the satellites. The server can also send an approximate location derived from cellphone towers, allowing an immediate fix. In some cases the A-GPS device may send incomplete GPS data to the server for processing into a fix. Because it is no communicating directly to the satellites as a standalone gps chipset does..

Lesson 3: Why the build-in gps receiver is dependable on the a-gps service not only for the "first fix" but for keeping it alive ...

Well tomorrow I will have more...going to bed now...