When i switch my tom tom one on, it sticks on the busy planning a route screen 'waiting for a valid gprs signal' everytime!?

Route will not plan until the GPS is locked.
Soft reset on the button underneath for 30 seconds will reset the GPS receiver on a 700.
Then wait upto 4 minutes for a refreshed lock after power up

Connect it to a computer and update the QuickFix on satellites.

make sure the rear of the unit has an unabstructed view out window.

Same here. I just finished updating software and it still can't get a signal. Could it be something with the TOM TOM satellite network?

I have the same unit and version as you. I notice the problem started yesterday at about 5:00 EST

you need to connect tom tom to the computer and download new updates from tom tom home.

My tomtom one screen kept showing that it was waiting for a valid gps signal all day yesterday 7/1/09 what can I do to fix this problem?

i work as a truck driver on a small fleet of 7 vehicles in the midlands UK

3 of us have Tom Toms, the others have medion, navman or garmin.

ALL the tom tom users have been experiencing GPS problems this week ( june 21 onwards ) whilst the rest of us have seen no change in GPS satelite availability.

In addition, a friend who uses a TOM TOM One XL in another part of the UK has also had same problems.

Its a TOM TOM problem generally it seems, and NOT your particular piece of kit.

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

If you are indoors then move outdoors to get a signal.

If you are outdoors then move your location by a few yards and sometimes it will suddenly aquire the satellites.

Happens occasionally with my unit. I normally set a route up then start driving and it suddenly starts to work OK.
HTH
Peter

Do a soft reset by holding the power button down for 15 seconds. then power on and off. it should work. It did for me. if not, call tomtom. they are willing to help quickly