Invalid signal

[Tastech]

a mate has a Tom Tom and whenever he power it up it comes up with invalid signal, any ideas ?

[Downunder35m]

Details??
Error messages??

[Tastech]

sorry about delay when he pwrs it up it only says

WAITING FOR A VALID GPS SIGNAL

nothing else

[mtv]

When was the last time it was updated with quickfix?

Quickfix is updated on line with TomTom Home and loads GPS satellite position information for faster loading/startup.

I'm assuming when it's started up the unit is correctly positioned outside/in a vehicle and left for at least 5 minutes waiting?

[Downunder35m]

Again: Details!
What TT?
What Navcore?

[Tastech]

My mate not very electronic savvy and am helping him by emails

When was the last time it was updated with quickfix? unknown will check hes only had it 8 months and used uit twice

Quickfix is updated on line with TomTom Home and loads GPS satellite position information for faster loading/startup. will see if he can do this

I'm assuming when it's started up the unit is correctly positioned outside/in a vehicle and left for at least 5 minutes waiting? yes

Will request his details again Dan

[Downunder35m]

Ok, if Home is used it can't be the GPS problem of the VIA series.
Especially after an update it can take quite a while to get the first sat fix.
If the quickfix data was updated through Home it should work in about 1 minute.
It is also possible that something went wrong during the update and the GPS data is corrupted.
Inside the "ephem" folder should be 3 files:
ee_meta.tlv
ee_meta.txt
packedephemeris.ee
Sometimes also a file lto.dat
If one of the first is missing or has 0 bytes than it is most likely corrupt.
You take the files from a backup or delete the content of the folder ephem and do an update through Home.

[Tastech]

thanks for your speedy replies will see how we get on

[puca]

also if it is a older tomtom i had a issue last year were i updated a freinds with a later navcore and it would not get a signal lock even if left sitting on his dash from sunrise to sunset connected to cig lighter had to put a earlier navcore back on it just check with him to see if it has had a update done since it has not been getting a signal

[Greg]

I found sometimes TomTom home may have trouble finding, downloading or installing the latest quickGPSfix data files. Which are used to lock onto satellite.

To overcome this I usually have to use tomtom home to
manage my <insert tomtom model>
remove items from computer
select quickGPSfix data and delete all
then rerun update.

Doing this will then guarantee the tomtom home will download the latest quickGPSfix data files.