You have to wait a few minutes for your GPS cell phone to acquire the coordinates of your current location when you get a cold start. However, you can always speed up satellites acquisition on your cell phone by using A-GPS.

There are two options for A-GPS:

- Always download satellites data from the A-GPS server via your nearby cell phone base station. When you travel to New York, your GPS cell phone will download New York satellites data, the same is true when you are in London. Now you can get your current coordinates in less than one minute wherever you go. However, you need a special A-GPS software which is not provided in most GPS maps.

-Download long-term satellites data from the A-GPS sever via mobile internet so that your cell phone do not need a cold start. In most cases, the satellites data downloaded is only valid in four hours. However, you can use a seven-day long-term satellites data to speed up satellites acquisition. The cons is, when you travel to another city, you need another cold start to download the local satellites data.

The second method is widely used, you can see that in many GPS cell phones where there are GPS+ services which is in fact A-GPS, when you run it, it will use your mobile internet and you will be charged for it.

In my case, the satellites data is valid in seven days on my Samsung I8910, and its really fast, even when in-house it only take less than twenty seconds to show my location on the GPS map.

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