The TomTom now takes 20 minutes to find a signal

try a soft reset
press and hold the reset switch DOWN for 30 seconds, release and power up.
Go outside and wait about 4 minutes, that usually does the trick on a ONEv3

Solution for No GPS Signal

To pinpoint your location, you need to get signals from at least 4 satellites. If you receive signals from less than 4 satellites or the signals are not strong enough, the Driving View stays gray and one of the following messages is shown in the bottom right corner of the Driving View:

• Waiting for a valid GPS signal
• The GPS signal was lost sec ago

Note: In previous versions of the TomTom application the message may vary.
If you see any of these messages, try the following:

Finding a GPS signal
In the following cases it can take up to 5 minutes to find your current position:

• You use your TomTom device for the first time.
• You haven't used your TomTom device for a longer time.
• Your TomTom device has been relocated without using it (e.g. after traveling by plane or train).

If it takes longer than 5 minutes, make sure that you are in an open place without tall buildings or trees around you.
Once your TomTom device has located your current position, the Driving View is shown in full color and shows your position on the map.
Tip: Most TomTom devices can use QuickGPSfix™ to locate your current position faster.

Flight mode
On devices with built-in GPRS connectivity, flight mode also disables your device’s GPS reception.
To switch flight mode off, tap Flight mode in the preferences menu and then select Restore connections.


Clear View
Your TomTom device must be outdoors to locate your current position.
Try repositioning your device in your car; ideally, try to position it at the lowest possible point directly on the windscreen.
Some vehicles have a heat reflective shield embedded in the windscreen, which may prevent your device from locating your current position. If this is the case in your vehicle, use the TomTom External Antenna Kit (available as an accessory).
Tip: As a reference, place your device outside your parked car to see if it can find your current position.


Reset your device
Reset your TomTom device. Click here to learn how to reset your device.


Install the latest application
We recommend always having the latest version of our application installed on your device.
See also: How to check for and install an updated version of the TomTom application?

TomTom had issues with the software on several versions of their GPS units. According to their website, it should take no longer than 5 minutes for your unit to acquire a signal. If it it taking longer than this, they recommend 3 possible solutions:
1. Reset your device
http://www.tomtom.com/7134

2. Install the latest application
http://www.tomtom.com/6218

3.Install QuickGPSfix
http://www.tomtom.com/4971

I hope the links help get your GPS working ASAP.
Good luck!

charge it up via the usb to computer cable for a few hours, then take it outside in clear view of the open sky and restart the unit and let it sit there up to 30 minutes.

if that fails, an update will probably cure the problem.

to find updates for your tomtom, download tomtom home Here if you dont have it already and follow the instructions after running tomtom home.


bill

try downloading tom tom home to your computer and use your dock or cable to connect it to your computer, switch on your tomtom and allow it to connect to your computer and updates should automatically happen, this should fix it, good luck

download the latest GPSfix updates using the tomtom home software

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.

try updating with the latest GPSfix updates via the tomtom home software

GPSfix updates are renewed weekly because the satelites are constantly moving

Plug in your tomtom and open my computer. Make note of the driver letter next to the tomtom symbol. Click Start, run (or search on vista or windows 7) and type in "CMD" without quotes and hit enter. a black window will open. type the letter you noted in my computer followed by a colon. Example: F: and press enter.
then type "chkdsk /f" without quotes and press enter. Answer yes to all the following prompts. once completed "takes less than a minute" type exit.

You can also try tomtom backup and then restore.

Finding a GPS signal
In the following cases it can take up to 5 minutes to find your current position:

• You use your TomTom device for the first time.
• You haven't used your TomTom device for a longer time.
• Your TomTom device has been relocated without using it (e.g. after travelling by plane or train).

If it takes longer than 5 minutes, make sure that you are in an open place without tall buildings or trees around you.
Once your TomTom device has located your current position, theDriving View is shown in full colour and shows your position on the map.
Tip: Most TomTom devices can use QuickGPSfix™ to locate your current position faster.

Regards.