It keeps saying waiiting for a valid GPS signal.

You are apparently NOT receiving satellite signals, nothing will change until it connects. Be sure to give the unit unobstructed view to the sky. If it never connects, unit will need repair.

Usually, when it's waiting to get a valid GPS signal, it is "listening" (scanning) for satellite signals to establish your current location. If you are in the open outdoors, i.e. not inside a building or under extended covers, it should get the satellite signals within a minute or so.

Not sure if this will help you or not. GPS needs a clear line of sight, tall buildings, bad spot in your car or on your dash, weather conditions and pink elephants all will interfere with the GPS signal. Keep the unit low and as far forward as you can so that it has the best chance for signal. Best position i have found is 3-4 inches above the heater vents on the dash and directly in front of you since this is the spot that is generally unobstructed by anything.
One final thing, sometimes you have to shut them down start driving then turn it on, they do sometimes lock themselves up and out of things. Don't know how or why but it does happen. See pink elephants for better results.
Hope this helps

charge it up good for a few hours, preferably the usb cord to your computer, then power it on and take it outside in full view of the open sky and let it aquire the satellites (up to 30 minutes)

if that fails, let me know and we can try a reset and update.


bill

The GPS needs at least 3 satellite signals to operate.You are probably in a bad reception area. Move around a bit and try again until you see a signal array of 3 or more!

my tomtom wont get a signal and is saying are you in a building?

check the port is set to 8
not sure if your model has GPS search wher it finds the port and vbaude automativcally, if it does use it and see if that fixes it if not
your battery is too low
you have a damaged SIIRF chip and that is expensive to repair

press the reset button on the side and wait for about 3minutes...

hi you need to reset the unit at the back near the connection there is a small button that needs to be held down when holding the power button on for a few seconds. once you have done this turn it on and it will work fine

http://www.tomtom.com/support/index.php?Language=1&query=no+maps&FID=386