LOCATION MY TOM TOM WORKED GREAT FOR ABOUT 5 MIN. THEN IT CHANGED TO GRAM MAP HOW DO I GET IT BACK TO A UNITED STATES MAP

have you downloaded software to talk to tom tom device and the web site for tom tom
http://au.support.tomtom.com/app/answers/detail/a_id/12493/~/installing-mydrive-connect
don't know if maps are free
http://uk.support.tomtom.com/app/answers/detail/a_id/15230/~/changing-map-on-navigation-device-with-computer

1- Signal strenght loss is a common problem, has to do with how often they refresh, whats on your dash and how good the line of sight is to the gps sattelites. Ironically the window mount that they give you can in some cases place the gps unit too far back from the window to get good clear reception.
2- You are out in the field because of the maps that you are using. Maps while mostly accurate are not exact and road changes that are made to sections of road may take years to show up in the map or might never show up. There are only two or three actual companies that do the gps survey work for the roads, and gps manufacturers like Tom Tom buy user rights to use these maps, so if a particular section of road has changed or been moved and nobody has been out to recalcute the changes then your gps will be off the mark.
Hope this information helps you out.

That is really strange!
I can only suggest that you verify what MAPs are physically on your TomTom device by connecting it to a PC/LAPTOP and use Windows Explorer to look at your GPS drive folders: should see a folder for each 'country' (like GUAM).
The normal way to check which maps are registred and loaded on your device is to use TomTom Home -> Update maps function: it will show you the status or whereabout of any Maps that you have loaded or backup and which one can be purchased.
Hope it helps: let me know how you go.
ps.i f you wisely backup your device on a regular basis (via TomTom Home or direct copy to your PC/LAPTOP), you could always RESTORE FROM BACKUP and start again.

Its done through the Tom Tom software on your computer. Once the Tom Tom desktop is installed you choose which maps you want to have in your GPS. If there is a Europe map in there, the software will allow you to delete the map and install the correct one.

Hi canal_boat_m

Try this solution:

STEP 1 Un-install Tom Tom Home from your PC

STEP 2 Click on the link below:

http://tomtom.com/lib/img/cs/S4S/files/RemoveRegEntries_TTGOv1.exe
This will download a little removal program for the Tom Tom Home program.
A Black window will appear briefly then close.
• Make sure that you have got Administrator rights on the PC. Otherwise you may not be allowed to connect new hardware (especially the case when using office computers)
• Reboot your PC

STEP 3 Visit Tom Tom website and download the current new version of Tom Tom Home and install it to your PC
STEP 4 Connect the TomTom

• Make sure the device is fully charged before connecting it to the computer. Ideally a mininum of 4 hours charge.
• Reset the device using a paper clip (see http://www.tomtom.com/6965). When resetting, keep the reset button pushed in for at least 20 seconds, but DO NOT turn the device back on just yet.
• Ensure that your TomTom has power connected to it. There should be a green light on the TomTom unit. If your device came with a Home Charger, please make sure that is plugged in to the TomTom also.
Your Tom Tom should ask you to 'Connect to Computer' if it does tap YES.

SOLUTION:
Your unit should now be recognized by your PC.

IF IT DOESN'T then follow the instructions below:

1. Connect your unit to your PC;
2. Copy two folders to your PC (namely 'Raster' and the one which holds all your maps - probably called 'United Kingdom and Eire';
3. Using Windows Utility, right click on the Tom Tom drive unit and select Fomat;
4. Switch off the unit and soft-reset it with a paper clip (but hold it in for at least 20 mins) and then re-connect it and power it up;
5. Tom Tom Home should now detect the unit and your unit should ask you to 'Connect to Computer' so tap YES;
6. Tom Tom Home will now say your device needs updating - and if you apply all the changes it will restore it to Factory Finished!
7. Then all's needed is to replace the two folders you backed up and any other items like mp3's and sounds, pics, etc.

Your Favorites are located in the Map directory in the TomTom.
For example if your using the North American map (North_America).
In a file named MapSettings.cfg.
When you update the map and some times the application this file is overwritten.
I recommend copying the file to the root directory of the TomTom or your computer if changes are made. That way you have a easy back-up of your favorites file.

Unfortunately to recover your old file you may damage other file in the process.

I hope this helps.

Steve

you can try and install new maps and update the firmware, go to tomtom.com and put it the serial number it should let you download the new firmware for it, that's how i got mine fixed.

I suddenly lost the GPS signal today and could not get it back. All I got was the "No valid GPS signal". My solution was to tap on the GPS satellite bars when in the route map. this brought up the "Status summary page of the TOMTOM.

I then again tapped the satellite bar which brought up the "GPS Status" page. I then tapped the bar labeled "configure".

The radio button next to the option titled "Minutes (dm.m') was selected. I then moved the selection to "Degrees (d.d) and it started working.

I had just downloaded the GPS fix 5 days ago so it is not like this suddenly caused it to stop working.

This may not work for everyone but this is what it took to get mine working.

Cheers

connect your unit to your pc when prompted by tom tom press yes. go to manage my one on your home page. on the manage your navigation go to item on device click on maps and check guam box and remove from device. only map left will be usa.