Have had this some times, if it takes too long >1min ik take out the battery, this resets it somehow and speeds the fix up. also in release 3.40 it seems te happen less.
Also watch out for windscreens with anti frost grids mounted in the glass, mine has this and it dims the signal a little so it will take longer to fix, try another car to see if this goes faster.
hope this helps, Peter
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With the right piece of hardware and software, it ispossible to triangulate your location anywhere on earth using satellitenavigation. These gamin devices cansuccessfully guide you from one place to another, or they can simply use theconnection with the satellite to tell you your exact current location. Thelatter function requires you to know how to locate the GPS device using theoptions onscreen. 1 Purchase a GlobalPositioning System (satellite navigation) product. There are manymanufacturers, including TomTom, NavMan and Garmin.2 Turn on the GPS and leave itfor a minute or so as it establishes a connection between the device and thesatellite. 3 Navigate to the"Current Location" option in the "Tools" or"Settings" menu (the exact pathway to this option depends on whichGPS device you have). The satellite signal will now successfully locate yourGPS device.4 Type a ZIP code or placename once you have located your GPS device. The gamin can now successfully guide you to your finaldestinationThanks.
"switch off your i3, press and hold down the arrow button, then the wheel and finally the power button. Hold all three buttons down until the i3 switches on. Select 'Yes' to erase all user data. Follow the instructions and again leave your i3 outside for up to 40 minutes."
What might help is a hard reset. This will force the unit to reload the satellite data/catalog and it should work after that. When you reset you will loose favorites rotes and other settings so back them up if you can and if you want them.
To reset your device to factory settings, go to Main Menu > Change preferences > Reset factory settings
restart the unit and leave it on and let it do its thing. Some updates can take a long time and until it is done you won't see any satellites or be able to navigate. Once it is finished it should now have the proper data to get positions.
If that doesn't work give TomTom a call and talk to tech support. They may have another way to reset or will be able to tell you if it needs to be repaired. They are a pretty helpful bunch.
Take the unit outside and turn it on. Then select View Maps, at the top of the screen it will say either "Locating satellites" or "Acquiring Satellites". Once the garmin has locked onto the overhead satellites, then it will say "Ready to Navigate".
Locating Satellites take longer than Acquiring Satellites.
This particular unit does take a long time to initialise. Try seitching it on at home and leaving it somewhere exposed to the sky ( not inside etc) It may just need to find out where in the world it is before it can start directing you where to go. If this fails - does your car have a windshield aerial for radio receptionor some kind of electric demisting which may interfere with the signal ?
Most GPS systems require a first time boot-up where they scan all registered satellites to determine where in the world they are and what satellites to concentrate their navigational efforts on. Try charging the GPS up entirely, and then doing a hard reset of the system (either by navigating to the hard reset in software or by pressing the tiny reset button usually located on GPS units), and then taking the system out under the open sky and letting it run for half an hour or so, making sure it is running in navigation mode (as opposed to setup or media mode). Once it locks properly onto a small subset of satellites, it should not have much difficulty.
If you continue having problems, check to be certain you are running the latest software on the device which can make a big difference. The latest software for the 520 is here: http://www.navman.com/Navman/Templates/standardcontent____4407.aspx