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GPS devices do not work inside buildings or in tunnels. Even outside, high-rise buildings or trees can interfere with GPS signal reception. Car navigation systems do not work through the roof of the car, they need to be mounted to the windshield of the car with free view to the sky, or use an external antenna. Some cars have metal coating on the windows for sunlight blocking or privacy protection. Such coatings may also block the GPS satellite signals.
Another problem: unlike TV satellites, GPS satellites do not have a fixed position relative to the ground, they move all the time. Your GPS device needs to locate and tune in on four satellites minimum first to start working for you. The scanning of the hemisphere to locate satellites takes several minutes (up to ten on Tomtom devices).
Tomtom devices use a device stored file with precomputed satellite positions to speed up the process to a few seconds. Since the file holds data only for about two weeks, the package "QuickGPSFix" needs to be updated at least once in a fortnight using the Tomtom HOME software, or it will fall back to the slow scanning procedure.
If you do have a different brand of GPS device, please add a comment to this post and I'll try to give further advice.
Tomtom devices need to locate GPS satellites in the sky in order to
work. Unlike TV satellites, these do not have fixed positions but move
relatively to the ground. The Tomtom can locate them by scanning the
hemisphere, but this takes up to ten minutes after you switch on the
To speed up the process, the Tomtom receivers can use a
helper file stored on the device. It holds precomputed positional data
for the GPS satellites that makes finding them a matter of a few
However, the file holds precomputed data for some two
weeks in advance only. After this period, the Tomtom device has to
resort to the slow scanning procedure.
You will need to connect your Tomtom device to a PC with the "Tomtom HOME" software installed, available from the Tomtom company web site.
Use the software by following the onscreen instructions to update the
package "QuickGPSFix" at least once every two weeks and you will find
your device much more swift in establishing GPS connection.
Note also, all GPS devices require clear view of the sky. They do not work inside buildings, in tunnels, through the roof of the car, and even trees or buildings near to the car may compromise GPS reception. Make sure the device is mounted in an area of the windshield where it can "see" the satellites. Some cars have metallic a coating on the windows (used for sunlight filtering and "can look outside - can't look inside" fancies). There are reports that these coatings also interfere with GPS receivers' ability to receive the satellite signals.
Are you indoors (inside a house, building, garage)? The GPS must be able to "see the sky" in order to get a signal. Please note that it takes a while for it to get a signal once it does see the sky. It must sync with several satellites before it can pinpoint your location and this takes a few minutes. If you are inside, move next to a window.
If you are outside, check to make sure that the GPS is near the windshield (or window of your car) and you aren't under the cover of trees or other objects. Anything between the satellite and the sky will obstruct its ability to sync. Unfortunately, they sometimes have trouble getting a signal on a cloudy day, too.
The samsung B7320 takes a real long time to get the 3D fix thats required by the navigatin softwares.
Check the following
1) In manual for see how GPS needs to be configured. I would recommend you keep the settings to Intermediate GPS driver.
2) If the settings are done as per requirement, take your phone in an open space and then see if the signals are available. Be patient as the fix takes a real long time sometimes even few minutes.
3) If the problem of no signals persists you need to test if your GPS chipset is working. Use turbo GPS for this.
Its not uncommon for some GPS to take a while to "warm up"
Check the tom tom site as some tom toms have a quick sat finder update. If you use tom tom home on your computer it usually has an UPDATE option where it will go online and get any fixes etc for your device.
Even then you may still see over a minute or so to boot up.
You might want to try updating your TomTom through TomTom Home. It loads something called "QuickFix" onto the TomTom, which I guess tells the TomTom where GPS satellites are going to be. I get a fix in about 5-15 seconds if I keep this updated, otherwise it takes a few minutes.
Make sure you are getting a good satellite signal. If you are not in a building it should start working after a few minutes. Does it say "gps signal lost ___minutes ago" in the bottom left hand corner?
Make sure your GPS is not blocked. Try to acquire sattelite signals in an open and clear area. From Main Menu, tab Sys Info. and tab GPS Reset. After this, wait for a few minutes and check GPS Status again. Sometimes it takes a while depending where you are located.